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Juyne 28,‘ 1938.
2,122,367
- R. F. DIRKES Er AL '
TELEQRAPH SWITCHING SYSTEM
Filed Jan‘. 8,1932
3 Sheets-Sheet 1
TRB
INVENTOR
R. F. DIRKES
syb?M ATTORNEY
v. R. KIMBALL
éQwmgm
_ Julie 28,1938.
2,122,367
R. F. DIRKES ET AL
TELEGRAPH SWITCHING SYSTEM
Filed Jan. 8, 1932
3 Sheets-Sheet 2
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‘Mimi ?n‘ -
INVENTOR
R. F. DIRKES
V. RKIMBALL
TO RELAY GROUP FOR SETTING
UP SIGNALS ON TRANSMITTING
DISTRIBUTOR OF ANOTHER
MULTIPLEX LlNE
BY
ATTORNEY
June28, 1938.
2,122,367
' R. F. DIRKES ET AL
I
TELEGRAPH SWITCHING SYSTEM
Filed Jan. 8, 1.952
3 Sheets-Sheet 3
FIG. 5
.u.
I.
i
A
Am
S-STD
INVENTOR
83
R. F. DIRKES
V.R.K|MBALL
BYQ/4f3"; ATTORNEY
62mm -
‘Patented June 28, 1938
52,122,361
- -, '
UNITED STATES
PATENT OFFICE '
2,122,367
TELEGRAPH swrrcnmo SYSTEM
Robert F. Dirkes, Jamaica, N. Y., and Vernon R.
Kimball, Palisade Park, N. 1., asslgnors to The
Western Union Telegraph Company, New York,
N. Y.,‘_>a corporation of New York
Application fJanuary s, 1932, Serial No. 585,582,
12 Claims. (01. 173-2)
This invention relates to printing telegraph
systems and more particularly to a telegraph
switching system.
from vone channel of a multiplex circuit to a
simplex circuit.
.
vReferring first to Fig. 1, we have shown a line
-
There is at the present time a tendency towards
L extending from a transmitter T at a branch
5 the creation of telegraph exchange systems in '- or subscriber’s oiIice and.v terminating at a main 6
which individual subscribers are equipped with o?ice in a‘ pair of serially arranged line relays
printing telegraph sending and receiving appa
LRI vand LRZ. The tongue of relay LRI is con
nected to the grounded winding of a magnet Ill
ratus of the ordinary start-stop type. The pres
ent invention relates to a telegraph exchange‘ " controlling the operation of a multi-contact se
10 system of this nature, one of the objects being
to provide facilities whereby the printing tele
graph subscriber may extend his line’ automatié
cally to a second subscriber located within the
same or in a distant city.
15
,
A more speci?c object is to eliminate‘auxiliary
switching mechanism at the subscribers’ o?lces
and make connections by direct manipulation of
the telegraph transmitting keyboard.
'
lector II. The selector is of the type operating
on a permutation code either of the ?ve or
six unit type, such as shown 'in our application
'Ser. No. 490,274, ?led October 20, 1930. It is
shown diagrammatically as having an annular
row of grounded contact rods I2, normally held
out of engagement with cooperating U-shaped
spring contacts I3, but being movable into en
gagement therewith, as in the case of contact‘
_
Still further objects are to enable the connec
20 tions to be made between two simplex lines, be
rod I2a, in response to a predetermined code per-'
mutation. Brie?y the essential parts of the se
tween two multiplex channels, or between a multi- _ lector II comprise a notched code disk for each
unit of the code, adapted to be moved into one of
plex channel and a simplex line.
I
'
Other objects and advantages of the invention ' two positions under the control of the magnet III,
will hereinafter appear.-
,
depending upon whether the associated code im-'
r
In accordance withour invention we employ a
25
switching device at the main station responsive
to regular telegraph code signals transmitted over
a line for transferring that line to another branch
line extending to a second 'subscriber’§ office.
30 Special code combinations, not used for regular
intelligence communication, may be employed to
e?ect the switching operation or the switching
combination may, at least in part, consist oi’ regu
lar intelligence code groups. In either case they
35 consist of code combinations of the same nature
/ as those used for regular communication and are
transmitted from the standard keyboard without
the necessity of any special signaling equipment
at the subscriber's o?ice.
40
.
-
In order that the invention may be more fully
understood, reference will behad to the accom
panying drawings in which:
I
Fig. 1 is a diagrammatic showing at a central
station, of one form of switching arrangement
embodying the present invention, for connecting
one simplex line to another;
'
’
Fig. 2 shows a modi?ed arrangement for effect-'
ing such switching operations;
50
Fig. 3 shows a further modi?cation employing
stepping switches;
55
I
pulse is of marking or spacing character. With 25
the code disks'set up by a received 'code combina
tion, a single row of notches will be arranged in
alignment,~allowing'one of the code bars I2 to
move'inwardly under spring pressure into en
gagement ,with (its associated contactv I3. This
type of ‘selector is well known in the art and,
therefore, has not been shown except diagram
matically.
,
One of the Ueshaped contacts I3!) is connected
to one terminal of the winding of a charging relay
I4, the other terminal of which is connected to a
source of potential I5. The remaining contacts
I3, with .one' exception, are-connected by in
dividual conductors I6 to one terminal of the
operating windings I'I o'f'a group of transfer re
lays TRr to TR-z. The opposite terminal of the
. windings I‘! are connected together by a con
ductor I8 and also to one terminal of a restoring
winding“, provided for each of the relays. The
opposite terminals of the windings -I9 are con 45
nected together by a conductor 2| and to, the
back contact of the relay I 4. The tongue of the
relay I4 is grounded through‘ a condenser 22
and the front contact thereof is connected to the
source of potential I5. The contact I3c of the
selector is connected-by conductor 23 to the right
I Fig. 4 shows an arrangement for transferring
one channel of a multiplex circuit to a channel
of another multiplex circuit;' and
‘
The right hand contact of each of the transfer
relays TR1 to TR-z is connected by a common con
Fig. '5 shows an arrangement for transferring
ductor 24 to the tongue of the line relay LR2.
hand side of the restoring windings I9.
‘
' 2,132,867
.
. The left contacts of the relays TRr to TR-i are _ is'connected to the solid ring so and the segments
connected to negative or marking battery and .I to 6 of ring 3| are individually connected to the
theqtongues are individually, connected to the windings of coding relays RI to R6. The dis
outgoing lines LI to L1, terminating at'remotely - tributor is shown with six segments, correspond
is as fol ows. Assuming the tongue of relay TR4
ing to a six unit permutation code, but obviously
the number Of'lImtS. of the code may be varied
by correspondingly changing the number of seg
ments and, thenumber of coding relays. The
to be .0
rest segment R of ring 3| is connected to_ground
arranged printers, which may be locatedin var
ious subscribers’ omces.
,
'
g
Theloperation of the system shown in 'Fig. 1
its vright contact and the tongues of
through the winding of-a brush releasing relay
l0 the remaining relayson their left or resting con
. ‘tact's, a circuit is completed from theline relay - 34, one contact of which is connected to a source
LR2 ‘ directly over the line L4. Consequently, ' of potential and the tongue of which is grounded
10
signals received over the line L are repeated'over through the start magnet 35. The brushes 36
the line L4. These signals ‘are also set-up on and 31 of the receiving and local rings respec
15 "the contacts of the selector II but‘, in the absence tively are normally held at rest by the latch 38.
' Each of the relays RI to R6 is provided with
vof a special code combination not used for reg
ular intelligence communication, by which the a plurality of- contacts adapted to be closed in
contact I3b is grounded, the relays TRi to TR': various combinations as the relays are energized,
do not respond and consequently the circuit to complete a selected ba?ie circuit from the con
20 through the line L4 is not interrupted. ‘If the ductor 39, connected in common to the tongues 20
operator at the distant end of the line L desires of relay I, to one of the contacts of relay 6.
to transfer 'to another subscriber, for instance, The conductor 39 is also connected to a segment
15'
one at the end of line L3, ‘he ?rst transmits av
4| of the local ring 33 and the contacts of relay
special _code combination which closes contact
R6 are individually connected by conductors 42 V
5 13b, energizing the relay‘ I4, which attracts its
to the operatingwindings ll of the relays TR1 25
‘tongue, applying the source of potential ‘I5 to ‘ to TRa, for, controlling the connection of the
. the condenser 22 to charge the same. This sig
nal group is followed by a second ‘group repre
sentative of the line L6 and which may be a coin
. 3o binatlon used for regular intelligence transmis
slon. This latter combination eirects a' closing,
oi'contact I3d, applying ground to the operating
winding I‘! of relay
Contact I3!) is released
at this timeypermitting the tongue of relay I4
35 to vdrop to its back contact and allowing the
condenser 2230 discharge through the restoring
_windings is or all of the selecting relays, in‘
parallel, and thence through the operating wind
line L to the lines LI to L8,
The left hand ter- '
minals of the restoring windings I9, of relays
TR1 to TRs, are connected by a common con
. ductor 43 to ground.
-
‘In the operation of this system each of the re
lays ’I'Ri to 'I'Ra is selected by a special code com
bination not used for regular communication
purposes. *However, it is to be understood that
the arrangement shown in Figure 1 for condi
tioning the selecting mechanism by a special .code
combination, so that it will respond to regular
.character code signals to effect a selection, may
' ing' ll of the single relay TRu to the grounded ' be used with the relay selector of Figure 2.
cont'act IN. This discharge through the restor
Since a sh: unit code is employed, the total ;
ing windings I9 is in such direction as‘ to bias
number of available combinations is sixty-four,
all the tongues to their resting contacts and the ' about three-fourths of which are necessary for
discharge through the operating winding I1 is. operation 01' the receiving printers, the remaining
in a direction to move the relay tongue in the combinations being available, for selecting pur
opposite ‘direction. Since’ only a small part of poses. When it is desiredto establish connec
the current passes through the restoring winding tion between the line L and any one of the lines
of , relay TR; and the entire current passes L] to L8, the combination 'representativeof the
through the operating winding of this relay, the desired line is transmitted. The'start impulse
latter winding predominates and the tongue is of thegroup is repeated by the line relay LRi
moved so as to complete the connection, from through'the brushes 36 and rest segment R to
",line relay LR2 to the branch line L0. The the relay 34, which in turn applies a starting im
‘tongue of relay TR4 is restored to its resting ~ pulse to the magnet 35 to trip the latch 33 and.
contact by the current through its restoring start the brushes 33 and 31 into rotation. Brush
winding. The operator at line-L may then carry 36 passes over segments I to 6 in synchronism
on communication with the operator at line Li. with the received selecting impulses in the usual '55 I
If the L line operator desires to disconnect‘ his manner, operating the relays RI to R6 in ac
line entirely from any oi.’ the branchlines, he cordance with the received permutation. 11' line
may do so by ?rst sending a special charging L2, for instance, isto be selected, relays Rl to
R5 would be operated, completing a circuit
vcode combination to close contact I31) and there
‘by operate relay I4 to charge the condenser; 22, through the top row of tongues and contacts of
followed by a second special code combination relays RI to R5 and upper tongue and its\lower
to close contact lie, so as to ground all of the contact, of relay R6, to the conductor 42 asso- '
restoring windings. The condenser 22 therefore
, discharges through all of the restoring windings
'in parallel, moving all of the relay tongues to
their resting contacts and thfeheby disconnecting
the line relay LR2 from all of the branch-lines.
ciated with relay 'I‘Rz.
The relays R'I to
R3 are 01' a type which retain their contacts in
a ‘set position until changed by the succeeding 65
code combination. Consequently as the brush
31 engages segment M, an impulse is transmit
ted from battery through ring 32, brush 31, seg
ment 4|, conductor 39, upper {tongues and upper
"70 is in the form of a start-stop distributor S—-SD 1 contacts of relays RI to R5, upper tongue and 70
In Fig. 2 we have shown a ‘modi?ed switching
arrangement in which the multi-contactlselector
- and a group‘ of multi-contact coding relays RI‘
\ to R3. The start-stop distributor comprises a
solid receiving ring 33, a segmented receiving
ring 3|, a solid local ring, 32 and-a segmented
i‘ local ring 33. The tongue of the line relay LE1
lower contact of relay R6 to the operating wind
ing I9 of relay TRz, thence by conductor II, to
each of the restoring windings I9 in parallel and
thence by conductor 43 to ground. All‘ of the
relays are'thus restored to their resting con-' 75
_
'
2,129,367
tacts with the exception of relay TR: which com
.
. 34
grounded and the other terminal connected by , _ .
pletes a circuit from the line relay LR2 to the' one of the conductors 1| to the individual con
line L2. ,Eonsequently subsequent signals trans tacts of the relay R5. The upper contact of relay
mitted over the line L will be repeated over the R6 is connected in series with a release relay ‘I2,
having its back contact connected to one contact 5'
line L2.
.
‘I of each of the switches 65 and 66.
In Fig. 3 we have substituted a group of step
The operation of this system is as ‘follows.
~ ping magnets 50 and 5| for the transfer relays
Each of the gang switches 65 to 61 is represented
TR1 t0}TRa- of Fig. 2. ' Each stepping relay con
sists of a'contact arm 52, normally urged toward by special code combinations not used for com
10' a stop 53 by a spring, not shown, and movable munication purposes and when it is desired to se 10
over. a series of contacts a to h by means of a
lect one of the switches to connect the incoming
the line L‘with one of thelines L| to Lls, -a
ground. Relay 12 thus opens its contact, remov
ing battery from the contact ‘I of each of the
magnet 54, pawl 55 and ratchet wheel 55. A channel to one channelof another multiplex cir
cuit, a code combination is ?rst transmitted to
locking latch 51 is provided for holding the con
tact arm in each set position. and is adapted to operate relays R2 and R6, thereby to complete
be retracted by a release magnet 58 to allow the the bailie circuit to relay 12 from the local seg
contact arm to be restored to its initial position. ment 13 of the local multiplex ring 14, through
The release magnets 58 are included serially in the tongue of relay RI and its lower contact,
circuit with the uppermost contact of relay R6. tongue of relay R2 and its upper contact, tongues
The operating magnets 54 are included in circuits of relays R3, R4 and R5, and their lower con
20 individual to the remaining contacts of relay R6. tactsiand tongueof relayRG and its upper con 20
With this’ system when it is desired to connect tact, to the winding of relay 12 and thence to
special release code combination is first trans
mittedlof such nature as to operate magnets R4
25 (and R6 and thus complete a circuit from the seg
ment 4| over conductor 39, upper tongues and ;
lower contactsv of relays Rl to R3, upper tongue
.and'upper contact of relay» R4, upper tongue and
- lower contact of relay R5 and upper tongue and
30 upper contact of relay R6 to the release magnets
58, which are energized thereby withdrawing the
locking pawlsv 51 to restore all or the contact
arms 52 to their insulated contacts and thereby
interrupting the circuit from line relay LR2
35 through the contact arm 52 to the lines Ll to Llc.
Following this ,a code combination representative
of one of the stepping switches 50 or 5| is trans
switches, thereby interrupting the circuit to any
of the operating magnets 69, the switch contacts 25
of which are closed. With all of the switches
open a second'code combination is transmitted \
representative of the particular gang switch to be
operated, thus, for instance, if switch 65 is to be
selected, selecting magnet R2 only would be oper 30
ated, completing the baf?e circuit from local seg- .
ment 13 through the upper tongue and lower
contact of relay RI, upper tongue and upper con
tact of relay R2, upper tongue and lower contacts
of relays R3 to R6 and thence by one of the- 35
conductors 1| to the winding 69 of relay 55. This
.impulse closes the gang switch 65 and completes a
mitted. This combination must be one not used , locking circuit for cell 69 from battery at the
for regular communication purposes. ‘If line L4 tongue “of relay 12 through the contact 'I of the
is to be selected, the combination representative gang . switch. With the switch 65 closed, the
of switch 50 will be repeated four times, thus signal combinations received over one channel of
operating the tongues of the selecting relays in ' the multiplex circuit are repeated over the con
such an arrangement as to complete the-circuit
from segment 4| through the magnet’54 each
time the ‘brushes of the distributor revolve.' With
the arm 52 of’ switch 50 locked “on contact (1 by
the locking pawl 51, a circuit is completed from
the line relay LE2, by means of conductor 60
and contact arm 52, directly to the line L4.
All of the foregoing systems have been arranged
for connecting one simplex line to another sim
plex line. In Fig. 4 we have shown an arrangement for connecting one channel of a multiplex
circuit to one of a plurality of- multiplex printers
55. or to a channel of another multiplex circuit oper
ating at the same speed. The incoming multi
plex line ML is connected to a line' relay LRa,
which repeats the signals to the solid ring 6| of
'the multiplex receiving distributor MRD, which
60 may have a number of channels, one only of
whichris shown complete. The ‘segments | to 6
of segmented ring 62 are connected through a
cabled conductor 63 to the windings of a group
.of code relays Rl to R6,_ arranged as shown in
65 Figs. 2 and 3. These segments are also connected
to the‘ contacts | to 6 of each of a plurality of
gang switches 65, 66 and 51. The opposing con
tacts of each gang switch are connected by con
ductors 68 to the selecting magnets of a multiplex
70 printer or to a group of storage relays, not shown,
for applying‘the code combinations to one chan
nel of a transmitting multiplex distributor asso
ciated with another multiplex line, not shown.
Each of the switches 65 to 61 is provided with
75 an operating magnet 69,_ having one terminal
ductors 58 to the segments of the multiplex trans
mitting» distributor associated with, ‘the other
multiplex circuit or to an associatedv multiplex
printer. Obviously both multiplex distributors
must be operated at the same speed andlany of
the various arrangements for maintaining [such
synchronism and phase relation as are known in
the art may be employed for this purpose.
In Fig. 5 we have shown means for transferring
from one channel of a multiplex system to any
one of a number of simplex circuits.
In this
arrangement each of the contacts of. the code
relay R6 is connected to the operating winding
of an individual transfer relay ml to TR4 in
the same manner as shown in Fig. 2. The relays
TR1 to TR4 control the switching of the multiplex
channel to one of the simplex lines Ll to L4.
The contacts | to 6 of the multiplex receiving
distributor MRD are also individually connected
to a group of six storing relays SR1 to SR6, the
contact tongues-‘l5 of which play between mark
ing and spacing bus bars 16 and 11 respectively.
The tongues 15 are connected to segments | to 6
of a start-stop transmitting distributor S-STD,
segmented ring 18 of which is also provided with
a start segment S and a rest segment R. Solid
ring '19 of the distributor is connected to the
right hand contacts of the transfer relays TR]. 70
to TRl. I The brush 8| is normally held in rest
position by a latch 82, controlled by a magnet 83,
energized when the multiplex brush passes across
local segment 84.
The operation is as follows. When it is desired '75
4
raaso'r
to select one of the lines Ll to LI 9. special code
.
_
_
w
cult to e?cnt a‘ connection between said‘ ?rst
combination representative or such line is trans
line and the associated line controlled-by said
mitted to complete a ba?le ‘circuit‘to the contacts '
- of the relay group Rl to R‘ and as the multi
predetermined selecting circuit. ‘ 3
. ‘
5.¢A printing telegraph? wstem comprising a
plex distributor brush‘ passesnon to segment 33 ‘ _line,_ means for transmitting a. succession o? code 5.
signals-oversaid line, a plurality‘ of associated
to the selected transfer relay, operating the same lines, a selecting circuit for each or said asso
and restoring the other relay tonsils to their‘ . ciated lines, a~,condenser associated with said' '
resting contacts. The ‘succeeding signals then selector circuits, means responsive to a special
- an impulse is transmitted‘over this baille circnit
,.
10
serve to set up the storage~ reiays SR1 -to SR‘ so
code combination for charging said condenser and I 10
> as to apply the'code combination to the segments
means resp-onsive to a succeeding code combina
of the start-stop transmitting distributor and as' tion for discharging the. condenser-through a pre
the multiplex brush passes local segment 84, the > determined selectingcircuit to effect a connec
start magnet 33 is energized, releasingthe brush tion between said ?rst line and the associated .
8| to complete one revolution and thereby trans
line controlled by said predetermined ‘selecting
mit the code combination ‘over the
‘line.
The transmission of the’ signal impulses proceeds
from the start-stop distributor, of course, during
6. Aprinting telegraph switching ‘system com-- prising ailine, means for transmitting a ‘suc‘cesy
the time of the reception of the. corresponding
sion of, permutation code-signals over said line,
‘signal imp'ulse of the succeeding signal group. ' a plurality of associated lines, means for connect-__
It will be understood, of course, in this modi?ca
tion that the signal combinations used to operate
the selecting relays TR1 to ‘IE4 must not be rated
tor regular communication purposes.
ing said ?rst line selectively to any one of said
associated lines and means whereby said ?rst
mentioned means is made responsive to a single
predetermined permutation code signal trans
_
It is obvious, of course, that numerous changes mitted over said ?rst lin‘e. /
25
may be made‘in the various systems proposed and ‘ '7. A printing telegraph switching system com-'
that other systems will be apparent from the in
prising 'a line arranged totransmit permutation
> formation given herein.
Accordingly, we do not - code signals, a main oi?ce at which said line ter
desire to be limited‘ to the exact details shown,
except as required by the terms of the appended
claims.
‘
What we claim is:
minates, a plurality of associated ‘lines also ter
minating at said main o?ice, means for simul 39
taneously connecting said line to av predeter
mined associated line and disconnecting ‘it from
1. A printing telegraph switching system com-I any of the remaining associated Zines to which
prising a line, means for transmitting code sig
it may have been connected and means whereby
nals over said line,‘ a plurality of ass'eciated lines, _ said ?rst mentioned means is made responsive-to‘ 35
a single permutation code‘signal received over
a selecting relay for each of- said associated lines
said ?rst line.
arranged to connect said ?rst line thereto and
8. A‘printing telegraph switching system com- ‘
means controlled by certain of said code signals ‘
for operating‘ a predetermined relay to connect
'40 said ?rst line with a desired one of said associated
lines.
-
.
-
2. A printing telegraph switching systemeom
prising a line arranged to transmitpermutation
code signals, a main o?lce at which said line‘,
' terminates, a plurality of associated lines also
- terminating at said main o?ice, a rotary distrib
utor at the main oi?ce, a group c-f coding relays.
prising a line, means for transmitting code ‘sig
nals over said line, a pluralityof associated lines,
a selecting device for each of said associated lines,
arranged to connect said ?rst line thereto and
means controlled by certain of said code simials
transmitted ‘over said ?rst line for operating a
‘predetermined selecting device to connect said
selectively to one of said ‘associated lines and
means for applying predetermined code signals,
received over said ?rst line, to said rotary dis
?rst line with a desired one of said associated lines
tributor tooperate said coding relays. '
and means controlled by“ other code signals trans
mitted over said ?rst line for disconnecting said
-' 9. A printing telegraph switching systemt"
comprising a plurality of multiplex lines termi
?rst line from said associated lines.
'
3. A printing telegraph switching system com
55 prising a line, means for transmitting code sig
_ nals over said line, a pluraiity of associatedllnes,
associated therewith, selecting circuits controlled
by said coding relays, means included in said -
selecting circuits for connecting said ?rst lin'e'
-
nating at a niain station and a selector mechan- _
ism common to said lines, said selector mechan
ism being responsive to predetermined code sig
nals received over a channel of one multiplex line‘
‘a selecting relay for each or said associated lines ‘for connecting said channel to one channel of
arranged to connect said ?rst- line thereto,’ an another multiplex line.
,10. A printing telegraph ' switching system
operating winding and a restoring winding for
each relay and means responsive. to certain code comprising a plurality of multiplex lines termii
cnmbinations for energizing the- operating wind
nating at a main station, a-switehing mechanism
ing of the relay associated with a predetermined ’ for completing connections between. a channel
one oiasaid associated lines and the restoring of one‘ multiplex line and a channel of another
‘ _ windings of the remaining relays whereby to con
multiplex line, said switching mechanism being responsive to‘ predetermined signal combinations
nect said ?rst line .to said predetermined asso
ciated line and disconnect it from the remaining received over a channel of one multiplex line for‘
interrupting its existing connections and con
associated lines.
‘
’
'
4. A printing telegraph system comprising a necting said channel to- a different multiplex
line,_means‘ for transmitting a succession of code
‘11. A printing telegraph switching system com
70 signals over said line, a plurality of associated
prising a multiplex line terminating at a main
lines, a selecting circuit for each of ‘said .asso
channel.
ciated lines, a condenser associated with said
selecting circuits and means respensive to a pre
determined code combination for discharging said
' condenser through a predetermined selecting cir
‘
‘
'
'
station,_aep_lur‘ality of simplex lines terminating
at said station and means responsive to prede
termined code combinations received over one
channel of the ‘multiplex line for e?ecti'ng con- 75
2,122,387
5
nectionsselectively between said channel and one
of said simplex lines whereby the succeeding sig
determined multiplex and simplex channels for
repeating signals therebetween, said means being
nals received over said channel will be repeated
over said selected simplex lines.
12. A printing telegraph system comprising a
said channels for varying the connections be?
tween said multiplex and simplex channels.
5
plurality of multiplex channels, and a plurality of
simplex channels terminating at said station, and
means for completing connections between pre
responsive to code signals received over one of
ROBERT F. DIRKES.
VERNON R. KIMBALL.
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