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Патент USA US2125771

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Aug. 2, 1938.
‘
v. A. DE CASTRO
STORAGE TANK FOR VOLATILE LIQUIDS
Filed March 7, 1936
Hll
2,125,771 '
‘
‘
3 Sheets-She“ 1'
Aug. 2, 1938.‘
v. A. DE‘CASTRO _
STORAGE TANK FOR VOLATILE LIQUIDS
Filed March 7; 1956
2,125,771
_
3 sheets-Sheet 2
Aug- 2, 1938.
.
v_. A. DE CASTRO
2,125,771
STORAGE TANK- FOR VOLA'I‘ILE LIQUIDQS
Filed March 7, 1936
3 Sheets-Sheet 3
Patented Aug. 2, 1938
2,125,111 A '‘
UNITED STATES. PATENT OFFICE j >.
'
2,125,111 _' "
,
STORAGE TANK
I
Vincent A. de Castro, Habana, Cuba
f j Application March ‘I, 1936, Serial No. 67,694
15Claims.
(01.
,
.in its travel.
volatile liquids such as gasoline and the like, and
has special reference to roofs or covers ?oating
-
‘
'
,
_
Figure 2 is a top plan view of the embodiment
depicted in Figure 1.
5 directly on the liquids stored within the tanks.
In the past, most of the tanks “for the storage
of volatile liquids with ?oating covers have de
pended mainly fortheir functioning either on
229-26)
showing the ?oating cover at" the lowest position
This invention relates to certain new and use
- iul improvements ‘in tanks for the storage oi’
g
'
'
Figure 3 is a fragmentary vertical section of‘ ‘5
the embodiment shown in Figure 1, but drawn to.
a larger scale, and showing the ?oating cover at
' the highest position in its travel.
'
-
expensive and readily impaired ?exible mate- ' Figures 4, 5 ‘and 6 are fragmentary..,vértic
_
10 rials, or on a more or less imperfect closure due sections of a .second embodiment of my improved 1°
to the fact that certain sealing members rising ‘tank, all three views showing the covenat its
and failing with the ?oating cover would press
lowest position. '
against the interior of the shell. These means '
Figure '7 is a' fragmentary verticalv section of,
a third embodiment of the tank of my invention.
could not ‘possibly attain a vapor-tight condition
15 due to irregularities in the surface of the sides
of the tank, and because insum‘cient pressures
were employed as, otherwise, the cover could
not descend. '
.
20‘ vide means to prevent or diminish the loss by
evaporation of the stored‘liquid while the latter
is 'being iilled into the tank and while such
liquid is held in storage, said, means consisting
primarily of successively formed liquid seals be
25 tween the ?oating cover and the sides or shell
of the tank; and hence neither a ?exible mate
rial is required nor a closure by means of a me- '
pressure.
,
,
.
Another object of my invention is to provide
v’ '30 ‘means to replenish and to drain the liquid con
stituting the liquid seal upon the use of which
depend the other objects sought.
‘
A still further object of my invention is to.
,
'
‘
' Figure 8 is a detailed view of one embodiment 15
of a column-guide for the cover.
‘
-
Figure 9 is a similar view of a second embodi
ment of a column-guide.
-
The primary object of my invention-is to pro
chanical
i
‘
,\ v
'
Referring to Figures 1, 2 and ,3, I have illus
tratively shown one embodime t of .my tank"20
with a shell 50 of same of sub tantially cylindrical construction, and provided with a roof .
or cover‘ III, which also is substantially rigid and
cylindrical andadapted for 'freelyrising and de-v
scending as it ?oats on the stored liquid mm‘ 25
accordance with principles well-known in the
art.
I provide means‘ whereby the ascending and
descending movement of cover ill can take place
without in the least impairing the'hermetically
30
sealed relationship of the cover witl; reference to
the portion of the tank containing the stored
liquid, as follows.
-
'
Y
.
As will be noted from the drawings, at the
'lpro've means whereby the ?oatingcover and
35 sealing media hereinafter described shall be con-;v periphery of the ?oatingwcover Ill, I have pro-‘ 35
vided an upwardly opening annular trough l2,
‘ strained to maintain certain convenient relative
positions ‘to each other and‘ to- the cylindrical adapted to'receive water or other ‘sealing ?uid ’
shell of the tank, and that such means shall not ' It, and I have ‘also provided, at suitable'vary
ing heights along the shell 50, and forming part
impair the condition‘ of hermeticity.
‘
' .
In general, it is the object of my invention, to ' thereof, ' similar upwardly opening annular
provide, while avoiding the use of ?exible mate- , troughs ll, I5 and I6, having sealing‘ ?uid ii
and adapted to receive‘sealing members ‘it, Is
rial or need for mechanical pressure, a new, im
proved simple economically-manufactured and
I ‘45 economically-operated wholly hermetic tank,
with a limiting cover, in which tank the evapo
ration losses and ?re hazards are reduced to‘;
minimum. - I achieve these objects and such
other objects as may‘ hereinafter appear or be
5‘; pointed out, in the manner illustratively exempli
?ed in the three embodiments shown in the ac
and 20, consisting of very thin metal sheets
"' duly reinforced with angles or other means.
.Esch of these members ‘is provided withitwo
. vertical depending ?anges 2i and 22 respec
tively, one of these depending ?anges being
adapted to extend downwardly into the sealing
liquid i3 and the ‘other into the sealing liquid ll,
thereby constituting a liquid seal between ‘the
cylindrical shell it and the ?oating cover l0.
' Columns ll, a?ixed to the bottom of the tank,
Figure 1 a a vertical sectional view ‘on line provide a support for the cover when in its low
companying drawings. wherein:
:
l--l of Figure 2, drawn to a relatively small
est position.-
55 scale, oi’ one embodiment of my improved tank,
'
.
fact um a liquid seal is maintained at 5‘
E
.
'
2
all
2,195,771 '
\.
is the keystone of my invention. The
such end Ii serving as an outlet for the excess
condition of continuous hermeticity is attained air-vapor mixture, and as an inlet for the ad
~ as follows.
'
mittance of outside air, depending on whether
Regardless of whether or not, with variations‘ valve" II or valve 44 shall at the time be func
5 in the level of the stored liquid. the ?oating
cover rises or descends, there will always be one
The foregoing and the following description ap
of the sealing members II, I! or 20, with one plies equally as well to the second embodi
depending ?ange 2i immersed in the liquid i3, ment shown in Figs. 4, 5 and 6, and to third em
' of the trough i2 and with the other depending bodiment shown in Figure '7, in all of which ?g
1o ?ange 22 immersed in the liquid ll, of one of ures the same numerals describe the like parts 10
the troughs I‘, II or I‘ of the shell of the tank, as Figures 1, 2 and 3. ,The main .di?er'ences
thus maintaining a liquid seal and the condition among the three embodiments are that whereas
tioning.
of hermeticity. This occurs since, as the ?oat
ing cover it rises, it picks up each sealing mem
15 her in. turn, and these sealing members will ride
up with the cover ll while the depending ?ange
II of one of the sealing members i8, i! or 2.
projects downwardly into the liquid it‘ within
the trough, and the other depending ?ange 21
~20 projects downwardly into the liquid ll of the
troughs i4, i5 and ii. on the other hand, as
the ?oating-deck descends it leaves behind one
after another of the sealing'members, suspended
from the vertical wall of its corresponding
25 trough M,‘ II or it on the shell of the tank, so
that the condition of hermeticity is maintained
in a similar manner‘ as described ‘for the upward
movement of the cover.
-
In the tank of my present invention, assuming
30 that the sealing member which is acting to main
tain a condition of hermeticit'y, be seated with its
horizontal annular ?ange resting on the top edge
-
-
>
in the ?rst embodiment the top trough iii and
top sealing member 20 serve to maintain a vapor
tight relationship when the cover is at the top of 16
its travel, in the second embodiment this func-> .
tion is assumed by an annular ?ange Ii, a?ixed
to the shell and a cylindrical skirt 42 depending
from the ?ange 4|; while in the third embodi
ment, (Fig. 7) the vapor-tight relationship is
20
maintained within the limits of the available
travel of the cover by only one deep trough i4
and one sealing member II.
In Figure 5 there is shown a means for con
straining the seallng member or members to 25
travel along de?nite paths which means, al
though applied to the ,tank of the second em
bodiment, are equally applicable to that of the
?rst and the third embodiments. I have pro
vided roller guides 21 and 28 on the outer de 30
pending ?anges of the sealing media, which roll
er guides 21 and 28 are constrained to follow rail 1
of the vertical wall of a trough on the side of the ‘ guides 28 and 30, carried by the troughs ?xed to
tank, then a rise in temperature will increase
35 the pressure of the air-vapor mixture‘contained
between the tank wall, the sealing member and
the ?oating cover but only until this pressure
reached the amount which Just sustains the
_ weight of. the said sealing member, at which time
40 the‘ pressure ceases to increase and the volume of
the air-vapor mixture increases, gradually lifting
the sealing medium as the temperature continues
to rise. In the same manner, a drop in tempera
ture will cause a decrease in the volume of the
45 air-vapor mixture and the sealing member, acting
at the time to maintain hermeticity will move
downwardly in proportion to such drop in tem
perature until the horizontal ring of the sealing
member rests again on the top edge of the annu
50 lar trough.
' -
The riseor fall of a sealing member automati
‘cally compensates for variations in pressure or
vacuum but, it being advisable to limit the values
of pressure and vacuum to certain predetermined
55 maxima, there are provided pressure-relief safety
' valve 5i , and vacuum-relief safety valve 44, which '
are accessories well-known in the art.
Whenever
the‘ pressure within the air-vapor space 3|,
reaches‘ a predetermined value, valve 5| auto
50 matically ‘opens and su?icient volume of the air
‘vapor mixture escapes into the air to reduce the
pressure to less. than a predetermined__maximum.
Similarly, whenever the partial vacuum in the
air-vapor space 34 reaches a predetermined
65 value, valve It automatically opens and sumcient
volume of the outside air ?ows into the air-vapor
space ll to reduce the value of the vacuum to less
than
a I predetermined
maximum.
Although
shown only ‘in Figure 6, valves II and. N are
70 equally applicable to the three embodiments of
the present invention, and all these valves are
the tank wall so as to force the sealing media i8
and II to follow de?nite paths in their travel. 35
These roller guides may be equipped, if neces
sary, with springs or' counter weights (not shown
in the drawings) to allow for variations from the I
vertical of the guides 2i and 30.
the sealing members like", while directly below '
on the corresponding sealing member like i8 are
provided male stops 33. When a sealing mem
ber carries along the next sealing member above
it, the relative position is maintained by the male 45
stops 33 engaging the female stops 32.
In Figure 6 only, I have shown the means pro
posed for replenishing the sealing liquid and for
draining the gasoline or other, liquid left in the
troughs upon the descent of the level.of the stored 50
liquid II.
For clearness, the a means for one
trough only have been depicted. It will be un
derstood that the other troughs on‘the shell are
similarly provided as by branches of pipe 35
which hermetically passes through theannular 55
?ange ll of the skirt, and through theannular
trough l5 and serves to feed sealing liquid ‘to
the trough H by opening of a valve 36.
An over?ow pipe 31, is provided for each trough
‘i4, i5, etc. and has branches ll and 39 provided 60'
to keep the liquid in the trough at a certain level.
Inasmuch as the liquids stored, probably gaso
line, will be lighter than the sealing liquid, prob
ably water, and not miscible therewith, ‘it will be
evident that this gasoline will ?oat on the water, 65
and the opening ‘of valve 30 will serve to add wa
ter to the troughs so that any gasoline left in
the troughs will over?ow through the branch -
pipes 38 and a and back into ‘the bottom of the
tank, thus'to ‘avoid any evaporation of gasoline, 70
any excess ‘water also over?owing and passing to
connected to the end of the U-tube 43 which lies ' the bottom of the tank.
outside of the tank. U-‘tube It passes through
the ?oating cover in an hermetic Joint and the
1
Female stops, 3!; are placed at intervals along 40
-
'
Referring specially to Fig.8, in order to coin-
the ?oating deck to follow de?nite paths
75, free end, li, lies within the air-vapor space 34, strain
In
“Ward and downward movements, I have 75.
2,185,771
provided a column guide 21 upon which bears a
~ 3
on the roof, a plurality of upwardly facing troughs
spaced vertically and ?xed _to the inner- face of
pipe-sleeve 215, which‘ is hermetically aillxed to
the cover II. The sleeve 25 is made to extend r the shell, and a sealing means for each shell
below the level of the stored liquid for the pur
trough including spaced‘ depending ?anges, one
» poseioi retaining any vapors which may be found
?ange'of each sealing means overlying the roof
between the cover it andthe liquid Ii. 'Bracing
trough, and the other overlying its shell trough
24 at top of these colunms 23 maintain these
more rigid, vwhile 26 is a stop to support rooi' l0
when at its lowest position.
10
.
the sealing means being wholly receivable each in the one above it, as the roof vascends.
3. A tank and roof construction comprising a,
shell adapted to contain ?uid, a root adapted to l0
overlie and ?oat upon the‘ ?uid so contained,
sealing means between the roof and the shell,
-
if desired, these column guides 23 can be wholly
. dispensed with, the cover being guided in its rise
and fall, by the sealing members l8.‘ l9, etc.
comprising, an upwardly facing annular trough
onlthe roof, a plurality of upwardly facing troughs
spaced vertically and fixed to the inner face of
the shell, and a sealing means for each shell
trough including spaced depending ?anges, one
?ange of each sealing means overlying the rooiI
trough, and the other overlying its shell trough,
_ In Figure 9 a second embodiment is shown of a
column guide M to constrain the ?oating deck to
16 vfollow de?nite, paths in its upward and downward
‘movements. ‘This embodiment differs from that
depicted in Figure 8, in that, at all times, through
out the available height of the tank, and regard
less of the relative position between the ?oating
20 deck Ill and the column guide II, a liquid seal is
maintained between such deck and said column. '
each shell trough being wider than the one im
mediately above it.
' This continuous liquid seal being maintained as ‘ -
follows. The ?oating deck I0 is provided with
,i an upwardly open annular trough 45 a?lxed to
the deck l0, andadapted to receive a sealing liquid
v
. liquid Qt and with the otherv adapted to immerse
in'the sealing liquid it. It will be evident that
no matter whether the ‘cover rises or descends,
within the available height of the container a
continuous seal will be maintained between the
depending skirts Just mentioned of the sealing
' medium and the corresponding sealing liquidsv it
~ and silt; ion-upon the rise of the cover to such
a.“
'
4. A tank and roof construction comprising a
shell adapted to contain ?uid, a roof adapted
to overlie and ?oat upon the ?uid so contained,
sealing means between the roof and the shell, t5
i6. _ Within the vertical column 3| there is pro
comprising, an upwardly'facingannular trough
vided anv upwardly-opening annular trough d1 - on the roof, a plurality of'upwardly facing troughs
adapted to receive a' sealing liquid 48; "a sealing spaced vertically and ?xed to the inner face of
member for, these two troughs, 41!, consists of a the shell, and a sealing means for each shell
30 downwardly~ open ‘annular trough with one‘ cy-. trough including spaced depending ?anges; the‘
lindrical skirt adapted'to' immerse in. the sealing
s
shell troughs increasing in width, and the spacing
,
of the. ?anges onthe sealing means decrwsihg
in width, from the top to the bottom of the shell.
'5. A tank and roof construction comprising a
shell adapted to contain ?uid, a roof adapted to to
overlie and ?oat upon the ?uid so contained, seal
ing means ‘between the roof and the shelhcom
prising, an upwardly facing annular trough on
the roof, a plurality of upwardly-facing troughs
an extent that‘ the depending smrt of the sealing ‘spaced vertically and ?xed'to the inner face of
the shell, and a sealing ‘means for each shell 40
trough, including spaced depending ?anges, one
?ange ofeach sealing means overlying the‘ roof
trough, and the other overlying its shell'trough,
deck, the liquid seal then being constituted by the the shell troughs increasing in width, and the
other depending skirt of the medium to and liquid spacing of the ?anges on the sealing means de M
dd; upon a downward movement of the deck, the creasing in width, from the top to the bottom
foregoing takes place in a reversed order,
of the shell.
,
‘
litv will be understood that although not shown in
6. A tank and roof construction comprisingu
the drawings, the tank will be provided with the shell adapted to‘contain ?uid, a roof‘adapted to
usual, inlet and outlet pipes, manholes, dip
overlie’ and ?oat upon the ?uid so contained, seal- MD
member 49 touches the bottom of the trough iii,
the sealing member to will .be carried upwards >1
with the deckafter which the sealing member will‘
rise with additional movement upward of the
45
50
hatches and other accessories well-known to those
skilled in the art.
‘
>
.
I do not limit myself to the embodiments here
55 in described, as it will be understood that various
modi?cations may he made without departing
'> l from the general ‘features of the invention.
What I - claim and desire to secure by letters
Patent is:
60
~
.
_
ing means between the roof and the shell, com~
prising, an upwardly facingv annular trough on.
the roof, a plurality of upwardly facing troughs
_ spaced vertically and ?x'ed to the inner idea of ,
the shell, and a sealing means for each shell‘ 55
trough including spaced depending ?anged-one
?ange of each sealing means overlying the roof
trough, andthe-other overlying its shell ‘trough,
l. Atanls and roof constructioncomprising a ?xed guide means for the roof, and liquid seal co
n'ieansv between the guide means and the roof.
‘ shell adapted to contain ?uid, a roof adapted to
overlie and float upon the ?uid so contained,
sealing means between the roof and the shell,
. 7. In a; tank‘ for volatile Munich, in comhina- ‘
tlon, a wall, a plurality of annular troughs se
comprising, an upwardly facing annular trough
on the roof, a plurality of upwardly facing troughs
spaced vertically and ?xed to the inner face of the
cured thereto‘ at di?ercnt levels and adapted to
receive sealing liquids, each trough being wider 65
than those "above it; a plurality of annular seal
shell and decreasing in. width, from lower to upper,
lug members with inverted U cross-sections, each
sealing member being wider than those located
and a sealing means for each shell trough in
cluding spaced depending ?anges each being tele
70 scopically receivable in'the one above.
2. A tank and roof construction comprising a
shell adapted to contain fluid, a roof'adapted to
overlie and float upon the ?uid so contained,
sealing means between the roof and the shell,
75 ‘comprising, an upwardly facing annular trough
beneath it, the sealing members being inde
pendently and freely vertically movable; a free
ly verticallyrmovable, independent, cover adapted
to
to ?oat upon liquid in the tank, an annular trough ‘
at the edge of the cover adapted to receive a
sealing liquid; one depending iiange of the nar
rowest of the freely movable sealing members en
4
2,125,771
4
..
.
gaging freely with the widest trough on the
wall, and one depending ?ange of the widest seal
ing member engaging freely with the narrowest
of such troughs,‘the depending ?anges of other
sealing members and troughs oo-acting similarly.
8. In a tank for volatile liquids, in combination,
a wall, a plurality of annular troughs secured to
?oat upon, ?uid contained in said shell, and seal
ing means between, the roof and the, shell, com
prising, an upwardly facing annular trough on
the roof, a plurality of pieces of general L-shape
in section, spaced vertically, and each fixed to
the wall, interiorly', at different levels and adapt
ed to receive sealing‘ liquid, each of such troughs
being wider than those above it; a like plurality
of annular sealing members with‘ inverted U
troughs vdecreasing in width vprogressively up
?ange overlying the roof trough, and one rela
the shell so as to form with the inner face of the
shell an upwardly facing annular trough, said
tively short depending ?ange overlying its shell
trough.
}
>
v
m
'
12. In a tank for volatile liquids, in combina
cross-section positioned at different levels, each‘
sealing member being wider'than those located tion, a cylindrical shell, an annular member of
beneath it, and independent therefrom and from general L-shape in cross-section, ?xed to the
shell, and forming with said face, an annular 15
15 the wall, all sealing members being freely verti
trough adapted to receive a sealing liquid; a sep
cally movable; a freely vertically movable, inde
pendent, cover having a trough adapted to re
ceive sealing liquid; one depending ?ange of each
arate, freely vertically movable circular cover
sealing member being adapted to engage freely
tank and of lesser diameter than that of said an
adapted to ?oat upon liquid contained in the '
. nular trough, an annular trough on the cover 20
with one of the said troughs on the wall, the nar
rowest sealing member co-acting with the widest
adapted to receive a sealing liquid; and means
trough on the wall, ‘and the widest sealing mem
ber co-acting with the narrowest of such troughs,
for establishing a liquid seal between the trough
of the wall and the ‘trough of the cover, which
comprises an annular, freely vertically movable,
inverted sealing member, U-shaped in cross-sec 25
tion, one leg of which overlies the trough of the
wall and the other leg of which overlies the
trough on the cover; ?xed guide means for the
cover, and liquid seal means between the ?xed
other sealing members co-acting in a similar pro
portionate arrangement, the other ?ange of each
sealing member being adapted to freely engage
-with the roof trough whereby when the cover
moves upwardly, it can carry along with it in
succession said sealing members during all of
which time some of said moving sealing members
are acting to constitute a liquid seal.
9. In a tank for volatile liquids, in combina
tion, a wall, a plurality of annular troughs se
curedsthereto at different levels and adapted to
guide means and the cover.
A
" '
30
13., A tank and roof construction comprising a
shell adapted to contain ?uid, a roof adapted to
overlie and ?oat upon ?uid contained in the shell,
v‘sealing means between the roof and the shell,
receive sealing liquids, each trough being wider comprising, an~upwardly facing annular trough as"
‘on the roof, a plurality of upwardly facing an
than those above it; a plurality of annular seal
ing members with inverted U cross-sections, each nular troughs spaced vertically and fixed to the
sealing member being wider than thoselocated inner face of the shell and decreasing in width
beneath it, the highest of ‘such sealing members progressively upward, and a ,sealing member for
being attached to the wall while the others arev each shell trough each including spaced depend
independently and freely vertically movable; a ‘ing ?anges, the spacing of which ?anges de
freely vertically movable, independent, cover creases in width progressively downwardly, each
adapted to ?oat upon liquid in the tank, an annu-’ sealing member being telescopically receivable in
'
lar trough at the edge of the cover adapted to the one above it.
14. A tank and roof construction comprising, 45
receive a sealing liquid; the ?xed sealing member
acting. when the cover is nearing its highest po ' a cylindrical shell adapted to contain ?uid, a cir
cular roof adapted to overlie and ?oat upon ?uid
sition, and the other sealing members acting be
low the highest position, one depending ?ange of contained in said shell, sealing means between the .
roof and the shell, comprising, an upwardly fac
the narrowest of the- freely movable sealing mem
bers engaging freely with the widest trough on ing annular trough on the roof, a plurality of an
the wall, and one depending ?ange of the widest nular pieces of L-shape in cross-section and ?xed
to the shell so as to form, with the shell, a plu
sealing member engaging freely withi'the nar
rowest of such troughs, the depending ?anges of rality of upwardly facing annular troughs, spaced
other sealing members and troughs co-acting vertically, and decreasing in width progressively
E upwardly, and an‘ annular sealing piece for each 55
10. A tank and roof construction comprising vshell trough, including spaced depending ?anges,
one ?ange of each sealing piece overlying the
a shell adapted to contain ?uid,,a roof loosely re
ceivable in said shell and adapted vto overlie and roof trough, and the other overlying its shell
?oat upon ?uid contained in said shell; sealing trough, the roof being of lesser diameter than the
means between the roof and the shell, compris '_ inner diameter of any shell trough. .
ing, an up-turned annular trough on the roof,
15.‘A tank and roof-‘construction comprising,
a shell adapted to contain ?uid,‘ a roof adapted to
an annular membenof general L-shape in cross
section, ?xed to one side of the shell with its
overlie and ?oat upon the ?uid so contained,
stem spaced from the shell so as to form with ' sealing means between the roof and the shell,
such shell an upwardly facing annular trough, comprising an upwardly facing trough on the 65
and a loosely-mounted annular sealing member - ' roof, a plurality of pieces of L_-shape in cross
having two spaced depending ?anges one over
section and ?xed to the shell so as to form with
such shell a plurality of upwardly facing troughs,
lying the trough onthe roof and the other over
lying the trough on the shell, the roof being of spaced vertically, each shell trough being wider
70 such dimensions as to allow it to freely ascend than the one immediately above it, and a sealing
_ to a level higher than that. of the trough on the — ‘ piece for each shell trough including spaced de
similarly.
-
'
‘
-
'shell
11; A tank andlroof construction comprising,
'
pending ?anges, the spacing of which decreases
in width progressively downward.
' _ aibell adapted to contain ?uid, a roof freely re
'oeivable insaid shell and adapted to overlie, and
,
l
'
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vmcmrr A.“ casino;
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