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Патент USA US2411191

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Nov. 19, 1946.
C. W. BURCKY
2,411,191
DIAL SELECTIVE CALLING SYSTEM
Filed Nov. 4, 1944
WI
WWI-lKEVm9v
INV ENTOR
CHARLES W. BURGKY
ATTORNEY
Patented Nov. 19,‘ 1946
2,411,191
‘UNITED STATES PATENT orrics
DIAL SELECTIVE CALLING SYSTEM
. Charles W. Burcky, Park Ridge, Ill., as‘signor ‘ta.
Teletype Corporation, Chicago, 111., a corpora
tion of Delaware
‘
Application November 4, 1944, Serial No. 561,876
1 Claim.
(Cl. 177—-—353)
v
1
.
This invention relatesto telegraph switching
.i-
2
.
similar to the permutations set up upon theplug
systems ‘and more particularly to station calling
and’ jack arrangement of the receiving station,
systems.
.a circuit Will be completedto an output relay.
hThe principal object of this invention is to
At the receiving station there is provided a ‘sole
noid which is operable to perform the function
of winding up the ‘receiving distributor ‘auto
provide an efficient and economical station selec
tion system.
Another object of the invention is to provide
a dial calling selective system which will oper
matically after a signal has ibeenpreceived. The
dial at the calling transmitter, however, is man
ually operated like the ordinary telephone dial,
ate on a minimum of power with the greatest
simplicity of design.
10
except thatthe same extent of movement is im
Brie?y, this invention relates to a station
parted upon each operation thereof, because
calling system employing at a transmitting sta
tion a manually operated dial mechanism which
upon each operation a ‘five unit permutation code
signal is transmitted, instead of a varying num
ber of impulses.
functions as a transmitter for sending signals,
and a, set of manually operable keys for per
mutably arranging signals generated by the dial
' mechanism for transmission over a line to a plu
rality of receiving stations associated with ‘the
line. Each of the receiving stations has an auto
anaticallyv operable mechanism acting as a re
ceiving distributor for receiving signals, a set of
manually operable selector elements associated
with the automatic mechanism and being con
15
‘ Having reference to the drawing, the station
l’inorecentral ‘station is shown on the left-hand
sideof the drawing and the station B or receiv
ing station is shown on the right-hand side of
the drawing. With the arrangement according
to the present invention, the operator at the
control ‘station A, throughthe operation "of the
?ve switches indicated generally as Il, may ad
just these switches ipermutably in accordance
with which one of a plurality of receiving sta
trollable by received signals for enabling the
transmitting station to select a particular receiv 25 tions he wishes to transmit to or to connect with.
ing station for operation upon an agreement be
The‘ station‘B is exemplary of a plurality of re
tween the permutative arrangement of the keys
ceiving stations which are identical in nature
of the transmitting station and the permutative
and wherein the plugs indicated generally as l2
arrangement of the selector elements at the par
may be inserted permutably into the jacks of a
ticular receiving station being called.
30 switchboard, indicated generally as £3, to cor
respond with the particular ‘signal pertaining to
Speci?cally, the arrangement consists essen
tially of a selecting system ‘wherein the trans
the particular receiving station. In this manner,
mitter distributor at the calling station is in
the signal which is transmitted from station A
the form of an ordinary telephone dial. At the
in ‘accordance with the setting of switches II
calling station, there is provided a set of keys . will be received by that-station B which has its
plugs I 2 set in the same permutable manner
which are electrically connected to ?ve segments
transversable by a brush associated With the tele
phone dial. By means of these keys, various
intotheyjack of switchboard l3, as will become
segments are connected to ?ve slow-to-release
relays each of which conditions a plug and jack
mented outer ring comprising a start segment
l9, ?ve impulse segments 2|, 22,23, 24, and 25,
more clearly apparent hereinafter.
I
permutations may be set up in accordance with
At the station A or calling station, the trans
the ?ve unit code in order to select a particular
mitting mechanism comprises a segmented
receiving station. At the receiving station, the
transmitting disc l4 and a telephone ‘dial device
receiving distributor, ‘which is in the form of a
i5 associated with a common shaft I6. Thedisc
tel'ephone‘dial, is released for operation upon the
H3 is ?xed or stationary and the rotatable shaft
receipt of the start impulse and has associated
96 extends therethrough and carries a brush arm
therewith ?ve segments similar to the ?ve seg 45 ll a?ixed to the shaft. ‘The disc 14 comprisesiia
ments of the transmitting distributor. The‘ five
continuous inner ring 18 ‘and a concentric seg
arrangement to control marking and spacing
and astop segment 26. The brush arm I‘! is
signals. Connectible to the jacks are a set of 50 provided with carbon brushes 2'! and 28 adapted
tocooperate with and bridge electrically the in
plugs which may be connected either to the
ner ring I8 and the outer segmented ring. The
marking or spacing side of the jack in order to
set up ‘particular permutations at the receiving
purpose of providing solid brushes is to facilitate
station. When the transmitting keys of the
rotation of the brush arm I‘! in both directions,
transmitting station are set in a permutation 55 as ‘will ‘hereinafter appear.
2,411,191
4
The telephone dial device I5 comprises a disc
29 ?xed to the shaft I6 and provided with an
aperture 3| for dialing the device. A ?xed stop
32 is provided for limiting the rotational or
closed, thus completing an energizing circuit for
a relay 94, from grounded battery, through con
tact 84, over conductor 95, through the winding
of relay 94, to ground. Relay 94 when energized
clockwise movement of the dial 29. Also ?xed to
the shaft I6 is one end of a spiral spring 33, the
other end of which is secured to a post 34 suit
will become locked up over a circuit extending
nected by conductors 5| to 55, respectively, to
locking circuit for the relay 94, which in turn
breaks the energizing circuit for the solenoid 93.
from grounded battery 96, through a contact 91,
‘over conductor 98, through a contact 99, then
through the winding of relay 94 to ground. The
ably mounted in the telephone dial structure.
energization of relay 94 also completes an ener
With this construction the shaft I6, When ro
tated clockwise through the instrumentality of 10 gizing circuit for the solenoid 93 from grounded
dialing hole 3|, will cause spring 33 to be Wound
battery IIlI, through contact I02, over conduc
up until the dialing'hole or ?nger has been
tor I 03, and through the winding of the solenoid
stopped by the member 32, whereupon when the
93 to ground. Moreover, immediately after re
leasing shaft ?8 for rotation, contact 83 will close
?nger is withdrawn and the disc 29 allowed to
be released, the shaft I6 will be rotated in a 15 to control electrical circuits, as will hereinafter I
appear.
counterclockwise direction to its initial position
under the control of the well known telephone
When the shaft ‘I8 has been released for ro
dial governor (not shown). Also ?xed to the
tation, the cord 88 will be wound around the shaft
shaft I6 is a disc 35 which is provided at suit‘
‘I8 thereby becoming taut between the shaft ‘I8
able angular positions, radially directed from the
and the screw 9 I. Then, when the contact “has
periphery, with a pair of lugs or projections 36
become closed and vthe relay 94 energized; as
and 31, which cooperate with a three-armed lever
just described, whereby the solenoid 93 hasbe
38 :pivotally mounted on a shaft 39 suitably
come energized, the plunger 92 will be drawn into
carried in the dial structure. Lever 38 is pro
the coil so that the cord 88 ‘will become unwound
vided with an arm 4I which'cooperate with the
from the shaft ‘I8, at the same time rotating the
shaft ‘I9 in a clockwise direction bringing'the
lugs'36 and 31, an arm 42 which cooperates with
arm TI from the stop 81 to be re-engaged by the
a contact 43, and an arm 44 which coacts with
a detent spring member 45.
'
shoulder ‘I6 of armature ‘I2.’ During this right
ward movement of the plunger 92 into the sole
In accordance with thepresent' invention, the
start segment I9 is connected by a conductor 46 30 noid 93 a ?ange I04 on the solenoid plunger v92
Will operate to open the contact 91 to breakthe
to a bus bar 41. Also, segments 2| to 25 are con
the contacts 56 to 60 of ?ve switches 6| to 65
Upon de-energization of the solenoid 93 due to
which, in turn, are connected to the bus bar 41.
the opening of contact I02 a spring I05 will act to
A signaling line 66 is connected at station A to
the bus bar 41 and at the station B to the winding
withdraw the plunger 92 from the solenoid coil
of a relay 67. A plurality of similar receiving
93, thus slackening the cord 88 as shown in the ‘
stations ‘ID are also connected in the signal
line 66.
Like the transmitting disk I4 at the transmit
The armature 68 of relay 6'! serves to complete 40 ting station, the disk or face plate 8| at the re
ceiving station B is similar thereto in the seg
a circuit, as will hereinafter appear, through con
mental arrangement. This face plate8| com;
tact 69 to start magnet ‘II of’ station B. Start
prises a solid inner ring I66 to which is connected
magnet ‘II is provided with an armature ‘I2 which
drawing.
-
-
r
»
one end of a conductor III'I, the'o'ther" end‘ of
terclockwise direction against a stop 15 by a 45 which terminates at the afore-mentioned con
tact 69. An outer concentric ring, comprising a
spring ‘I4. The free end of the armature lever ‘I2
plurality of segments is associated with the inner
is provided with a shouldered or hooked portion
ring I66 and comp-rises, like the arrangement at
‘I6 adapted to cooperate with the end of a stop
the central station A, a. start segment I08, ?ve
arm ‘I‘I secured to a distributor shaft ‘I8,
Also ?xed to the shaft ‘I8 is a brush arm ‘I9 50 segmentsI99, III, H2, H3, and H4 which con
which cooperates with a stationary face plate 8|
stitute the code impulse segments, and a stop seg
ment H5. The brush arm ‘I9 is provided with a
of the receiving distributor of station B. An arm
pair of carbon brushes, one cooperating with ‘the
82 is secured to the shaft ‘I8 and cooperates with
inner ring I96 and the other with the outer seg
a pair of contacts 83 and 84 in a manner and
for the purpose hereinafter described. Fixed to 55 mented ring. The start segment I98is connected
by a conductor II6 to the winding of the start
shaft ‘I8 is one end of a spiral spring 85, the
other end of which is ?xed to a spring post 86.
magnet ‘II. The segments I99, III, H2, H3, and
Spring 85 is normally in a wound condition tend
H4 are connected by conductors H1, H8, H9,
is mounted on a pivot ‘I3 and is biased in a coun
I2I, and I22, respectively, to the winding of re
rection, thereby holding the arm 'I'I against the 60 lays I23, I24, I25, I26, and I21, respectively. The
windings of slow-to-release relays I23 to' I21,
shouldered portion ‘I6 of armature ‘I2, so that
when the magnet ‘His energized, as will appear
inclusive, are connected also to a co'mmon'con
ductor I28 which terminates at the afore
presently, the armature ‘I2 will be attracted to
mentioned contact 83. Relays I23 to I21 are each
withdraw the shoulder ‘I6 from the arm 11, thus
provided with a locking circuit which extends
releasing the shaft ‘I8 for rotation by the spring
85, such rotation continuing until the arm 11
from grounded battery I29, over common con
strikes a limiting stop 81. When this latter ro
ductor I3I, through individual contacts I32,
through the-windings of the various associated
tation occurs, a cord 88 will be wound around the
relays I23 to I21, then over the common'con
shaft ‘I3; Cord 88 is ?xed at one end 89 to the
shaft ‘I8 and at the other end to a screw 9| se 70 ductor I 28 and through contact 83 to ground. ‘
Each relay I23 to I2‘! is also provided with an
cured to the plunger 92 of a solenoid 93. When
armature I33 which cooperates with. a marking
the shaft ‘I8 has been released for rotation to
bring the stop arm 11 against the stop 81, the
contact I34 and a spacing contact I35, individual
thereto. When a relay is energized, a marking
arm 82 will have been rotatedcto the position
shown in dotted line, whereby contact 84 will rbe 75 contact is closed;'' and‘ when‘ “a relay is. de
mg to bias the shaft ‘I8 in a counterclockwise di- ,
2,411,191
5
6
as contact 43 has been closed, a circuit is com-i
energized, a spacing contact is closed. Each
pleted from battery I41 through contact 43, over
marking contact I34 is connected to a marking
conductor‘ III, through ring I8, through carbon
jack I36, and each spacing contact I35 is con
brush 21, over the brush arm I1, through the
nected to a spacing jack I31. Each armature I33
carbon brush 28, through start segment I9, over
is electrically connected to the panel board I3_
conductor’ 46, through bus bar 41, over the sig
Five plugs I38, I40, I68, I69 and I19 are pro
nal line '66, through the winding of relay 61, to
vided, one for each pair of jacks I36 and I31.
ground. The re1ay‘61, upon being energized,
Each plug is provided with a tip portion which
pulls up its armature .68 to complete a circuit
is connectible with the jack I36 or I31, and a 10 from grounded battery, through the armature 68,
ring portion which connects with the panel board
through contact 69,iover conductor I 81 , through
I3. The set of ?ve plugs may be connected to
ring I86, through the brush arm 19, through start ‘
either the marking jack I36 or the spacing jacks
segment I88, over conductor I I6, and through the
I31 to set up a particular permutation at the re
winding of magnet ‘II to ground. Upon the com
ceiving station in accordance with its call signal.
pletion of this circuit, the rotation of the dial or
15
A series circuit through-the set of plugs and
receiving distributor at the receiving ‘station is
through an output relay I39 may be ultimately
initiated due to the fact ‘that the‘ armature 12
completed therefor only when the ?ve relays I23
is attracted. Upon attraction of the armature 12,
to I21 have been selected by a permutation code
the arm 11 is released for rotation, energy for
signal which matches the positions selected by
rotating the shaft 18'being stored in the spring
20
the ?ve line plugs. Initially, however, due to the
66. The brush arms I1 and 19 are thus arranged
fact that the attract time of the armature I6I
to rotate in phase with each other under the con
of relay I39 is sufficiently long to permit the
trol of the well known telephone dial governor
brush 19 to traverse several segments before the
(not shown) associated with each shaft. It is to
contact IE3 is closed, the lamp IE5 ‘(or other ap
be noted that the synchronism and phase condi
paratus to :be controlled) will not be operated un
tions are required for only one revolution of the
‘til the entire code signal has been received. In
shafts I1 and 19.
this way, a circuit through the output relay I39
The switch device I I comprising the switch
upon the reception of any one of a plurality
arms 6|, 62, 63, 64, and 65 is capable of being
of di?erent permutation signals, and the signal
adjusted into any one of a plurality of permuta
required to select any given station, may be
ble positions by employing various combinations
changed at any time by inserting the line plugs
of the switch arms in their two positions. These
in the jack in any one of said plurality of dif
ferent possible combinations. It is understood,
switches, of course, may be of any commercial
form such that they may be manipulated to give
therefore, that the setting of the plugs at the
‘a permutative setting characteristic of the sta
35
stations B or similar stations will be character
tion it is desired to call. Assuming that the
istic of the calling signal for that particular
switch arms ‘6| to 66, inclusive, are arranged in a
station.
permutative setting whereby the contacts 56,
General operation
The system according to the present invention
is illustrated in the drawing in the normal stop
position. In this position the brush arm I1 at
the central transmitting station rests upon the
stop segment 26, ‘and the brush army 19 at the
receiving station rests upon the start segment
I88. The reason for this manner of connection
is so that upon the initiation of the call at the
station A the mechanism at the station B will be
I in readiness to receive the start or initial im
pulse so as to initiate, in response to the start
signal received from the calling station, the ap
58, and 68 are closed by the switch arms BI, .
63, and 65, respectively, and it is desired to call
a station having plugs I? arranged in this ‘iden
tical setting, the operator upon operating the dial
at the calling station A will be connected to one
and only one station B; namely, that which is
connected in a predetermined manner with the
same permutative ‘setting, that is, marking im
pulses on the ?rst, third, and fifth signal inter
vals of the code combination. At the receiving
station B, plugs I38, I60, and I18 will have been
inserted in the marking jacks, and plugs I40 and
I68 will have been inserted infthe spacing jacks.
paratus or mechanism at the called station. By
As the brush arms I1 and ‘I9 now rotate in syn
means of the aperture 3I in the disk 29 the dial
chronism they will traverse the corresponding
code segments in proper timed sequence. For
mechanism is rotated in a clockwise direction
the full distance up to the stop 32. When this
example, when the segment _2I is being traversed
has been done the spiral spring 33 is wound and 55 bythe brush arm I1, a signal impulse is trans
the disk 35 has been rotated to the position in
mitted from battery I41, through the contact 43,
dicated by the dotted line positions 236 and 231
of lugs 36 and 31, respectively. At the initial por
tion of its rotation lug 31 of disk 35 acts upon
arm III of lever 38 to rotate it to the dotted line
position 24 I, thus opening contact 43 and causing
detent 96 to hold arm 46 in a detented position.
By this revolution, the brush arm I1 is rotated in
a clockwise direction to bring the carbon
brushes 21 and 28 into contact with the start seg
ment I9 and ‘the concentric solid ring I8 prepara
tory to transmitting the initial or start impulse
over conductor I4I, through ring I8, over brush
arm I1, through segment 2|, over conductor 5|,
through contact 66, over switch arm 6 I, through
bus bar 41, over the signaling line 66, through the
winding of relay 61, to ground. Whenever such
a marking impulse is transmitted over the sig
naling line 66, the relay 61 becomes energized to
85 attract its armature 68. As previously described,
brush arm I1 passes over segment I9 as arm 19
passes over segment I88 to ‘impress a start
(marking)
upon the closing, subsequently, of the contact 43,
as will appear presently. As the disk 35 was ro
tated, the lug 36 was carried past the dotted po
sition 2“ of arm 4i so that when the disk 29 was
impulse upon start magnet 1I.
Thereafter, brush arms I1 and 19 traverse sub
"10
stantially simultaneously with their respective
segments ZI' and I89, then segments 22 and III,
etc.
As the brush arm 19 passes over the start seg
strumentality from the aperture 3I, the lug 36
ment I88 the arm 132 permits the contact 83 to
‘acts to bring the lever 38 out of detented posi
close, thus preparing the operating ‘circuit and
tion to permit the closing of contact 43. As soon 75
released upon withdrawal of the rotating in
2,411,191
locking circuit for the slow-to-release relays I23
to I 21, inclusive. In the present instance, as the
vstationiwill'not'be energizedand the armature
brush arm 19' passes over segment I I19, the brush '
thereof will rest on the spacing contact I35 thereof.
arm I 1 is passing over the segment 2 I. Since the
switch 6| isclosed, a circuit is completed to relay
spacing jack.
The plug I49, therefore, will belinserted
in the
'
With this arrangementiit is seen that a series
61 from battery I41, through the contact 43, over 5
circuit is completed through the series of plugs,
conductor I4I, through ring I8, over brush I1,
from ground, through the various circuits, as
through segment 2|, over the conductor 5|,
previously described, then through the winding
through contact 56 and switch BI to bus bar 41,
whereupon the signal impulse is transmitted over 10 of relay, I39 to grounded battery. Since the out
put relay I39 is now energized it will attract its
the signaling line 36 to the relay 61 which be
armature I5I and complete a circuit from
comes energized and attracts its armature 68.
grounded battery I52, through armature I5I,
A'circuit is thereupon completed from grounded
through contact I53 (now closed), over con
battery, over armature 68, through contact 69
(now closed), over conductor I01, through ring 15 ductor I54 to (in the present embodiment) a
signal lamp I55. Of course, it is understood that
I06, over brush arm 19, through segment I09,
the output relay I 39 controls any sortof circuit
over conductor I I1, through the winding of relay '
such as a repeater or other electrical arrange
I 23, over conductor I 28, through contact 83, to
ment. For example, should it be desired to sus
ground. Relay I23 becomes energized and at
tracts its armatures I 33 and I42. The closing 20 tain the closing of the contact or contacts asso
of armature I42 closes its contact I32 to com
plete a locking circuit for relay I23 from
grounded battery I29, over conductor I 3I,
through the armature I42, through contact I 32
ciated with relay I39 for a predetermined time,
not less than a certain value, the relays I 23-—I21
are made slow-to-release so that the rewind time
of shaft 18 (that is, from the time contacts 84
are closed and relay 94 and solenoid 93 are oper
associated with relay I23, through the winding
of relay I23, over conductor I28, through the con 25 ated until contact 83 is again opened) plus the
slow-to—release time of relays I23-I21, plus the
tact 83 (now closed), to ground. The armature
slow-to-release time of relay I 39 will give this
I33 of relay I23 is attracted (as indicated by dot
ted lines) and closes the marking contact I34 as
value. For this reason, the relays I23~I21 are
sociated therewith, and since the plug I10 asso 30 slo-w-to-release.
As the shaft 18 continues its rotation, the arm
ciated with the jack of the relay I23 is inserted
in’ the marking jack position, a circuit will be pre
11 will strike against stop 81, and the brush arm
pared from ground, through the ring portion of
19 will rest upon the stop segment I I5. On assum
plug I10, then through the panel board I3, over
ing this position the contact 84 will be, closed, as
conductor I44, through the armature I33 of re
lay I 23, through the marking contact I34 thereof,
over the conductor I45 to the marking jack I33
thereof, then over the tip‘ side of plug I10 to the
conductor I46.
previously described, to introduce battery upon
the circuit for the relay 94, which, as previously
described, is effective to control the energization
of the solenoid 93. Cord 88 which has just been
battery I41, through contact 43, over conductor
I4I, through ring I8, over brush arm I1, through
energized. The dial at the transmitting station
has been returned by spring 33 to its initial
segment 22, and over conductor 52.
position so that now both the station A and sta
tion B are in their normal rest position prepara
wound up on the shaft 18, will be unwound by
As the brush arms I1 and 19 traverse further 40 the pulling in of the solenoid 32, thus imparting
clockwise rotation to shaft 18 until the 'stop
and contact the segment 22 at the central trans
arm 11 is locked behind the shoulder 16 of the
mitting station and segment I I I' at the receiving
armature 12 of the magnet H which is now de
station,,respectively, a circuit is prepared from
But, since
switch 52 is not closed, no circuit will be com
pleted thereover, and hence, relay 51 connected
tory to sending out another call signal which
to the line 65 will not be energized. Accordingly,
the armature 68 will not be attracted, so contact
69 will not be closed. Therefore, no circuit is
completed for relay I24, and armature I33 of
relay I24 will be held at the spacing side I35 (as
may be the same as previously described, or of any
shown). The circuit previously described from
ground .149, will be continued over the ring side
other'of a plurality of permutations which may
be set up on the switches 6| to 65, inclusivait
being understood that the signal transmitted from
the station A will be received by and cause to
operate the apparatus at that station B which
has its plugs I38 set in the panel board I3 in a
of plug I38 associated with relay I24, then 55 permutative combination identical to the setting
of the switches SI to 65.
through the panel board I3 and through the
Although the present invention has been de
armature I33 of relay I24, then through con
scribed in connection with its speci?c embodi
tact I35 and spacing jack I31 thereof. The cir
cuit will then be completed over the tip side
ment thereof, it is understood that such applica
of plug I38 to conductor I46.
60 tion is merely illustrative and not restrictive, the
scope of the present invention being de?ned only
As the brush arms 19 and I1 traverse the suc-_
by the scope of the appending claim.
ceeding segments, circuits for relays I25, I26
What is claimed is:
_
and I 21 will be completed depending upon
In a selective station calling system, a trans
Whether or not contact switches 63, 64, 65 are
closed. In the present instance, it is noted that 65 mitting station, a plurality of receiving stations,
a signal line connecting said stations, transmit
contacts 63 and 65 are closed and therefore,
ting means at said transmitting station compris~
marking impulses will be transmitted over the
signaling line when segments 23, H2, 25 and H4
ing- permutably settable switching elements and
an impulsing device manipulable from a normal
are traversed, and relays I25 and I21 will become
energized. The plugs I 50 and I38 associated with 70 position to an ultimate position, said device effec
tive upon return to normal position to impress
relays I25 and I21, respectively, are connected
through said switches start-stop permutation
to their respective marking jacks, and circuits
code signals upon said signal line, receiving means
will be completed therethrough. Since the switch
:64 is not closed, the relay I 26 at the receiving
comprising a line relay responsive to signals im
V75_.pressed on said signal line, an automatically oper
2,411,191
able impulsing device normally tending to oper
ate, storing relay means electrically associated
with said impulsing device, electromagnetically
controlled means effective normally to restrain
said impulsing device against operation, said elec
tromagnetically controlled means responsive to
10
trollable instrumentality electrically associated
with said plugs, whereby an energizing circuit for
said instrumentality is established when said plugs
are arranged in said jacks in correspondence with
the permutation code setting of said settable
switching elements, and further electromagnetic
means e?ective upon completion of operation of
the start impulse of said permutation code signals
said automatically operable impulsing device to
to initiate operation of said automatically oper
automatically return said automatically operable
able impulsing device to distribute the signal im
device to normal position for reopera
pulses of said permutation code signals to said 10 impulsing
tion under control of said start-stop permutation
storing relay means, a plurality of serially asso-‘
code signals.
ciated plugs, a corresponding series of jacks, one
CHARLES W. BURCKY.
jack associated with each storing relay, a con
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