US665801A - Electric burglar-alarm. - Google Patents

Electric burglar-alarm. Download PDF

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US665801A
US665801A US1121500A US1900011215A US665801A US 665801 A US665801 A US 665801A US 1121500 A US1121500 A US 1121500A US 1900011215 A US1900011215 A US 1900011215A US 665801 A US665801 A US 665801A
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circuit
armature
magnet
lever
arm
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US1121500A
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John W Rough
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00Exposure-making shutters; Diaphragms
    • G03B9/58Means for varying duration of "open" period of shutter

Definitions

  • connection l independently of othersignaling devices, the same'may, if desired, be used in connection l, with the fire apparatus shown and described or set of circuit-closers, to be suitably arranged 45 zen of the United States, residing at La,
  • ' is to provide a device'wherebya burglar cause the transmission of an audible signal through the medium of a'telephone system to parties atdifierent points, who may be in communication with the police department.
  • 1, 2,3,and4 each designates a group said groups adapted upon one floor of the house in which the alarm is used and similar groups 5, 6, 7, and 8 may bearranged upon the second floor of said house.
  • These circuitclosers maybe of various forms. Those shown close upon the opening ofdoors or 'windows of the house,
  • cleetromagnet 9 is included an cleetromagnet 9, as will be plain by an examination of Figs. 1 and 2 of the drawings. These circuits are normally open, and therefore the armatures 10 are normally removed from their respective magnets 9, being preferably held in retracted position by means of coil-springs 11, as shown.
  • the magnets 9 may be arranged at any desired point relative to the circuit-closers, and are all preferably arranged in close proximity to each other in the room or inclosurc wherein is situated a graphophone or phonograph signal device of suitable construction, such as will.
  • This device consists of a series ofcylinders 12, mounted upon a common shaft 13, provided with a gear-pinion 14, which meshes with a gear 15, mounted on a driving-shaft 16, to which is connected a suitable motor, as 17.
  • This motor may be of any desired form. I prefer to drive the phonograph-cylinders intcrmittently or only when an alarm issentin, and therefore provide a stop or like device which will be hereinafter described.
  • Each cylinder bears a ple, the location of the building to which the system is applied and in addition the particular portion of that building wherein are located the circuit-closers ofthat particular local circuit which controls the'position of the transmitter or reproducer 18,a dapted to transmitthat record.
  • the reproducers 18 are each mounted'upon a tube or conduit 19, preferably in the manner shown and described in the patent hereinbefore mentioned, and said tube 19 extends from points adjacent to the cylinders 12 to an ordinary telephone-transmitter 20, which is arranged in an electrical circuit, such as will suitable rccord-for exam- IOO ,circuit, which, as it is, the means for assisting the transmission of signals produced by the 23 ee5,so1
  • a second wire 2-3, extending from the magnet 23, is secured to a stud 26, suitably mounted at a' oint adjacent to the armature 10 and adapted to contact therewith when the same is out of contact'with its magnet 9.
  • a second stud 27 is mounted adjacent to the .armature22 of the magnet 23'and is connected to a wire 28, having a suitable battery, as 29, thereon
  • the wire 24 is connected by means of a wire to the magnet 9 of the second circuit, as shown, and a wire 31, having-a battery, as 32, thereon, is connected by means of the wires 33 and 3% to the armatu res 10 of the magnets 54. It will be seen that each of the magnets 23 is connected to the wire 30.
  • i 35 designates an electromagnet which is arranged. in a circuit including the battery 29 and wires 28 and 36.
  • 'lhe'wire 36 01 this breaking of either of the hereinbefore-de- -scribed local circuits,- may be termed the common circuit, isconnected with the ar-' matures22 of the local-circnit magnets 23, andth'e other wire 28 is connected with the series of contact-points 2'7, hereinbefore described, said points beingarranged adjacent to and in the path of each-of the said armatures 22.
  • the armature 3'? of the clcctromagnet 35 is pivotally supported and normallyheld in engagement with the lever-arm 38 by means of a spring-39.
  • This lever-arm 38 is pivotally mounted at one end, as shown, its opposite end l0 .normally bearing upon the upper end of t-hearmature 37, as shown.
  • This lever-arm 38 is secured to a wire 41 of an electric circuit connected to the transmitter 20, which includes also a magneto-generator 42, and is adapted, as will be hereinafter described, to be connected with the regular line of circuit connecting the telephone 3 with the central or exchange oiliee.
  • This stop device preferably consists of a lever pivotally' mounted upon a bracket, as 47, one arm of which is adapted to engage with a toothed 'wheel 48 upon the shaft 44, while the otherarm is connected bymeans of a cord or other flexible device 49 to the lever-arm 38, hereinbefore described.
  • arm of a lever 50 mounted upon a bracket 51 and adapted to act as a stop for holding the power-shaft 16 .of the graphophone signal apparatus stationary.
  • Contactfpoints, as 52 and 53 are arranged below the leverarm 38 at the terminus of the wires 54 and This cord isalso connected to one 55, respectively, that are connected with the wires 56 and 57, leading from the telephone 43.
  • a camera 58 of any suitable construction may be arranged atany desired point within each of the rooms of the house.
  • This camera is preferably provided with a shutter 59 of substantially the form shown in Figs. 1 and 2 and pivoted at one end, as at 60, to the easing of the camera.
  • This shutter is provided with an aperture 61, which is adapted to register with the lens-opening within the casing when the shutter is partially raised, saidlensopeningbeing so located as to be closed when the shutter reaches its upper or lower limits of travel.
  • a suitable flexible connection, as 62 connects said shutter with the arm 38 and may be arranged in any suitable manner.
  • a bracket63 substantially as shown in Fig. 3, to which is pivotallymouuted a verticitl substantially bell-shaped plate 04, the
  • a cord 68 or other ileXible device connects the plate (it with the lever-arm 38, hereinbefore described.
  • Each of the local'cirenits of this apparatus may be provided with a circuitdweaker," as 69, whereby the operationof the apparatus may be prevented, as desired.
  • T-hese circuitbreakers are prei'erabl y placed upon the wires which do not connect with the magnets 23, ll
  • the magnets 23 are normally in circuit, the current passing from the battery through the wires 3t 25, armatures l0, and wire 3* back to the battery 32, as isobvious. It will therefore be seen that the armatures 22 are normally held in contact with their magnets Whenever either of the local circuits is closed by means of the circuit-closers l, 2, 3, l, 5, G,
  • the current from the battery will energize the magnet- 9 of said circuit and attract the armature l0. This will, as is obvious, break the circuit at the point 26 and release the armature 22 of the magnet 23, causing the reproduccr to fall upon the cylinder 12 of the phonograph. At the same time the armature 22 will contactwith the stud 2'7 and form acircuitincluding the wires 28 and 3G and the battery 20, charging .the
  • the action of the magneto-generator 42 causes the current '0 to pass over the wires 71 :1nd 72 of the regular telephone-circuit and through the signal apparatus in the ccntralofiice back over linewire 73 and wire 57 to contact 53, and thence to the magneto-generator over or through 5 lever 38 and the wire 74, connecting it with the said generator. A portion of this current also passes through the telephone instrument 43, ringing the signal thereon.
  • the local current of the transmitter 20 is Lery 75', then through the lever-arm 38 to contact 52, and from there through the primary circuit 76 of the induction-coil and over wire 77 back. to the, transmitter. 'lhis ind uces a 5 currentin the secondary circuit oi" the inwire 57 and through the contact 5 5 and lever 38 back to cont-act 52 and wire 51, which is connected with the secondary or the inductive coil.
  • the burglar-alarm apparatus when used 'in connection with the fire-alarm apparatus may be of the construction shown in Fig. 2, in .which butone magnet is used in each commoncircuit andeircuit-breakers 80 are used in lieu of the closers 1, 2, 3, 4 5, 6, 7, and 8, hereinbefore referred to.
  • the operation of the local circuits of the burglar-alarm apparatus shown in said Fig. 2 is the same in every respect as that of the fire-alarm apparatus described. in the above-mentioned pat cut.
  • graphophone or phonograph I mean to include any of the various forms of apparatus for producing the human voice or other sounds which may be adapted for use in my improved system.
  • an automatic burglar-alarm apparatus the combination of a magnet in a normally'open circuit, an armature thereto in circuit with a normally-energized magnet, an armature to said normally-cnergized magnet, a contact-point adjacent thereto, a magnet in circuit with said armature and contact-point and adapted to bc cncrgizcd by the release of thearmature, an armature 37, a lever-arm normally supported by said armature, a camera,a sh utter pivoted thereto and having florible connection with tho lever-arm, a plate pivoted adjacent to the camera and having a flexible connection with said lover-arm, and a l'rictionalsurfaco to said plate adapted to ignite llashing material bythe movement thereof, said shutter and plate being operated by the release of the lever-arm.
  • a pivoted plate ed to be operated by the release of said arm, a pivoted plate, a flexible connection between said plate and the lever-arm, a friction-surface to the plate, material adjacent to the friction-surface adapted t0 be ignited by the movement thereof, and a flash-light cartridge adjacent to said material.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Description

BEST AVAILABLE com J. w. ROIUGH.
Patented Jan. 8, IQOI.
ELECTRIC BURGLAR ALARM.
(Application filed Apr. 2. 1900.)
(No Model.
2 sheetkshm No. 665,80l.
(No Model.)
BEST AVAILABLE COP;
, Patented lari. a, 19m.
J. W. ROUGH.
ELECTRIC BUBGLAR ALARI.
(Application filed Apr. 2, 1900.)
2 Sheet's-Shaet 2 Qwuawtoo J'o/m 5a 1201 mgam attozwmg To all whom zit may concern:
independently of othersignaling devices, the same'may, if desired, be used in connection l, with the fire apparatus shown and described or set of circuit-closers, to be suitably arranged 45 zen of the United States, residing at Orleans,
ro -and its .primary object.
thrpugh a window, door, (he, or stepping .'--'up o n -'suitably-disposed circuit-closers will more fully described, claimed, and illustrated in the aeeom the"preferred form of. my invention, and in wh1chz.
hereinbefore referred to, and Fig.
at 1, 3, 5, and 7 maybe so constructed as to S eEs'r AVAILABLE COP:
UNITED STATES JOHN W. ROUGH, OF
PATENT ()FFICE.
ORLEANS, IN DIANA ELECTRIC BU RGLAR-ALARM.
. SPEGIFICATIO J Y forming part of Letters Patent N 0. 665,801, dated January 8, 1901. V
Application filed April 2, 1900.
Beitknown that I, JOHN W..ROUGH, acitiin the county, of Orange and State of Indiana, have inventednew and useful Improvements in Electrical-Burglar-Alarms, of which the following is a specification. "This. invention relates to new and useful mprovements in -.electrical burglar-alarms;
' is to provide a device'wherebya burglar cause the transmission of an audible signal through the medium of a'telephone system to parties atdifierent points, who may be in communication with the police department.
Afnrtherobjectis to provide means of novel constructiomwherebya likeness of the intruder will be automatically secured.
While the invention is adapted to be used in thepatent to George 0. Halo, dated August QQlnVeDfiiOtl consistsin the novel constructiofi? and combination of parts hereinafter panying drawings, showing Figure 1 isadiagrammatical view of a burglar-alarm system embodying my p resent improvements; Fig. 2 isa similar view showing the same used in connection with the firealarnr system covered by the Letters Patent 3 is a detail viewof a flash-lightattachmcntadapted to be used in connection with the camera.
;-Referring to said figures by numerals of reference, 1, 2,3,and4 each designates a group said groups adapted upon one floor of the house in which the alarm is used and similar groups 5, 6, 7, and 8 may bearranged upon the second floor of said house. These circuitclosers maybe of various forms. Those shown close upon the opening ofdoors or 'windows of the house,
while the circuit-closers shown Serial No. 11,215. No model.)
the rooms and adapted to close when a weight is placed thereon. I do not claim. any particular form of circuit-closer, as any suitable construction may be employed. Buttons, as iand 8, may be suitably arranged within the circuits, whereby said circuits may be closed by hand when desired. I
It will be understood that the circuit-closers 1, 2, 3, audit-are arranged uponacircuit which is independent of the circuit having the closers 5, (3, 7, and 8.
In each of these circuits.
is included an cleetromagnet 9, as will be plain by an examination of Figs. 1 and 2 of the drawings. These circuits are normally open, and therefore the armatures 10 are normally removed from their respective magnets 9, being preferably held in retracted position by means of coil-springs 11, as shown. The magnets 9 may be arranged at any desired point relative to the circuit-closers, and are all preferably arranged in close proximity to each other in the room or inclosurc wherein is situated a graphophone or phonograph signal device of suitable construction, such as will.
be more fully hereinafter described. This device consists of a series ofcylinders 12, mounted upon a common shaft 13, provided with a gear-pinion 14, which meshes with a gear 15, mounted on a driving-shaft 16, to which is connected a suitable motor, as 17. This motor may be of any desired form. I prefer to drive the phonograph-cylinders intcrmittently or only when an alarm issentin, and therefore provide a stop or like device which will be hereinafter described. Each cylinder bears a ple, the location of the building to which the system is applied and in addition the particular portion of that building wherein are located the circuit-closers ofthat particular local circuit which controls the'position of the transmitter or reproducer 18,a dapted to transmitthat record.
The reproducers 18 are each mounted'upon a tube or conduit 19, preferably in the manner shown and described in the patent hereinbefore mentioned, and said tube 19 extends from points adjacent to the cylinders 12 to an ordinary telephone-transmitter 20, which is arranged in an electrical circuit, such as will suitable rccord-for exam- IOO ,circuit, which, as it is, the means for assisting the transmission of signals produced by the 23 ee5,so1
scribed. A second wire 2-3, extending from the magnet 23, is secured to a stud 26, suitably mounted at a' oint adjacent to the armature 10 and adapted to contact therewith when the same is out of contact'with its magnet 9. A second stud 27 is mounted adjacent to the .armature22 of the magnet 23'and is connected to a wire 28, having a suitable battery, as 29, thereon The wire 24 is connected by means of a wire to the magnet 9 of the second circuit, as shown, and a wire 31, having-a battery, as 32, thereon, is connected by means of the wires 33 and 3% to the armatu res 10 of the magnets 54. It will be seen that each of the magnets 23 is connected to the wire 30. i 35 designates an electromagnet which is arranged. in a circuit including the battery 29 and wires 28 and 36. 'lhe'wire 36 01: this breaking of either of the hereinbefore-de- -scribed local circuits,- may be termed the common circuit, isconnected with the ar-' matures22 of the local-circnit magnets 23, andth'e other wire 28 is connected with the series of contact-points 2'7, hereinbefore described, said points beingarranged adjacent to and in the path of each-of the said armatures 22. The armature 3'? of the clcctromagnet 35 is pivotally supported and normallyheld in engagement with the lever-arm 38 by means of a spring-39. This lever-arm 38 is pivotally mounted at one end, as shown, its opposite end l0 .normally bearing upon the upper end of t-hearmature 37, as shown. This lever-arm 38 is secured to a wire 41 of an electric circuit connected to the transmitter 20, which includes also a magneto-generator 42, and is adapted, as will be hereinafter described, to be connected with the regular line of circuit connecting the telephone 3 with the central or exchange oiliee.
To the shaft 4- of the generator is geared a suitable motor 45, and a brake or step device 46 is-provided for normally preventing rotation of said shaft; This stop device preferably consists of a lever pivotally' mounted upon a bracket, as 47, one arm of which is adapted to engage with a toothed 'wheel 48 upon the shaft 44, while the otherarm is connected bymeans of a cord or other flexible device 49 to the lever-arm 38, hereinbefore described. arm of a lever 50, mounted upon a bracket 51 and adapted to act as a stop for holding the power-shaft 16 .of the graphophone signal apparatus stationary. Contactfpoints, as 52 and 53, are arranged below the leverarm 38 at the terminus of the wires 54 and This cord isalso connected to one 55, respectively, that are connected with the wires 56 and 57, leading from the telephone 43.
BEST AVAZLABLE com A camera 58 of any suitable construction may be arranged atany desired point within each of the rooms of the house. This camera is preferably provided with a shutter 59 of substantially the form shown in Figs. 1 and 2 and pivoted at one end, as at 60, to the easing of the camera. This shutter is provided with an aperture 61, which is adapted to register with the lens-opening within the casing when the shutter is partially raised, saidlensopeningbeing so located as to be closed when the shutter reaches its upper or lower limits of travel. A suitable flexible connection, as 62, connects said shutter with the arm 38 and may be arranged in any suitable manner.
At a point adjacent toeach of the cameras. is seen red a bracket63,substantially as shown in Fig. 3, to which is pivotallymouuted a verticitl substantially bell-shaped plate 04, the
on er edgcof which is roughened, as alt-65,
and adapted to contact with the head of a' match 66 or other-suitabledevice, which will ignite from frictional contact therewith, and a suitable cartridge 67, containing flash-light material, is arranged adjacent to the match and adapted to be ignited thereby. A cord 68 or other ileXible device connects the plate (it with the lever-arm 38, hereinbefore described. I
Each of the local'cirenits of this apparatus may be provided with a circuitdweaker," as 69, whereby the operationof the apparatus may be prevented, as desired. T-hese circuitbreakers are prei'erabl y placed upon the wires which do not connect with the magnets 23, ll
which support the phonograph-reproducers. The magnets 23 are normally in circuit, the current passing from the battery through the wires 3t 25, armatures l0, and wire 3* back to the battery 32, as isobvious. It will therefore be seen that the armatures 22 are normally held in contact with their magnets Whenever either of the local circuits is closed by means of the circuit-closers l, 2, 3, l, 5, G,
7, and S, the current from the battery will energize the magnet- 9 of said circuit and attract the armature l0. This will, as is obvious, break the circuit at the point 26 and release the armature 22 of the magnet 23, causing the reproduccr to fall upon the cylinder 12 of the phonograph. At the same time the armature 22 will contactwith the stud 2'7 and form acircuitincluding the wires 28 and 3G and the battery 20, charging .the
magnet-35, which will'attract its armature 37, and thereby release the lever-arm 38, which, under the pull exerted by the spring 70, secured t-hereto,as shown,will be thrown against thetwo contact- points 52 and 53,.as is obvious. Such movementot the lever-arm 38 releases the shaft t; of the generator 42 and the action ofthe latter rings the call-bell of the telephone 43, which call being transmitted over the wires 56 and 57 notifies the operator at the tact-poiuts52 and 53 the-record on the par- Io and over the wires 54, 55,,66, and 57.
3 "releasing thephonogra'ph mechanism, and at :5 light attachment'fiet aredporated through the 2o ter registers, therewith.
nit-ion ofirhefiash-light, material.
understood that when the cord 68 is operated by the lever-arm 38 the plate 64\ 'ill be swung go as follows: From the transmitter to the bat sired, be used in connection with the sysiom patent.
ST AVAILABLE core central oilice that connection for the purpose of-transmitting spec h should be made with the telephone 43. I soon asthe connection is made between the lever-arm 38 of the conticular graphophone-cylinder whose reproducer has been. brought into opcratiye position will..be transmitted to the operator at the central. station through the Lrhnsmiiter When the lever-arm 38 falls upon the contact-points 52 .and 53, the lqg fer 50 is raised, the same timethe shutter 59 and the flash-- cords '62' and 68,.qonpectedt0 said arm 38. It will be seen that asthe shutter 59 is thrown upward the lens of the camera is exposed to view, when the aperture 61 within theshut- The cord 62 is preferably slack',j so that the shutter of the camera will be operated subsequently to the ig- It will be upon itscasing',"causing its roughened surfacc to ignite the, mat'ch 66, which in turn will ignitethma rtridge 67. The action of the magneto-generator 42 causes the current '0 to pass over the wires 71 :1nd 72 of the regular telephone-circuit and through the signal apparatus in the ccntralofiice back over linewire 73 and wire 57 to contact 53, and thence to the magneto-generator over or through 5 lever 38 and the wire 74, connecting it with the said generator. A portion of this current also passes through the telephone instrument 43, ringing the signal thereon. The local current of the transmitter 20 is Lery 75', then through the lever-arm 38 to contact 52, and from there through the primary circuit 76 of the induction-coil and over wire 77 back. to the, transmitter. 'lhis ind uces a 5 currentin the secondary circuit oi" the inwire 57 and through the contact 5 5 and lever 38 back to cont-act 52 and wire 51, which is connected with the secondary or the inductive coil.
central or exchange ol'licc is advised of the exactlocationof the burglar. 'lhcsigual will be repeated until the motor 17 is run down.
VVhile'I have hcreinbei'ore described this covercdby Patent No. 630,315, which may he i operated independently thcrool to indicate fires. 830., as shown and described in said If desired, the burglar-alarm apparatus when used 'in connection with the fire-alarm apparatus may be of the construction shown in Fig. 2, in .which butone magnet is used in each commoncircuit andeircuit-breakers 80 are used in lieu of the closers 1, 2, 3, 4 5, 6, 7, and 8, hereinbefore referred to. The operation of the local circuits of the burglar-alarm apparatus shown in said Fig. 2 is the same in every respect as that of the fire-alarm apparatus described. in the above-mentioned pat cut.
By the term graphophone or phonograph, I mean to include any of the various forms of apparatus for producing the human voice or other sounds which may be adapted for use in my improved system.
Having thus fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is i 1. In an automatic burglar-alarmapparatus, the combination with aphonograph-cylinder; of a reproducer suspended adjacent thereto, a normally-energized magnet, an armature to said magnet secured to the reprodueer, an armature in the circuit of said magnet, a magnet adjacent to the armature and having a normally open circuit, a contactpoint adjacent to the armature of the normally-energized magnet, a magnet in circuit with said armature and contaetpoint, said circuitadapted to he closed by'the release of the armature, an armature to said magnet, a camera, a shutter thereto, a lever bearing upon said armature and adapted to be released by the attraction of the armature to its magnet, and a flexible connection between the lever and shutter.'
2. In an automatic burglar-alarm apparatus, the combination of a magnet in a normally'open circuit, an armature thereto in circuit with a normally-energized magnet, an armature to said normally-cnergized magnet, a contact-point adjacent thereto, a magnet in circuit with said armature and contact-point and adapted to bc cncrgizcd by the release of thearmature, an armature 37, a lever-arm normally supported by said armature, a camera,a sh utter pivoted thereto and having florible connection with tho lever-arm, a plate pivoted adjacent to the camera and having a flexible connection with said lover-arm, and a l'rictionalsurfaco to said plate adapted to ignite llashing material bythe movement thereof, said shutter and plate being operated by the release of the lever-arm.
[u an automatic burglar-alarm apparatus,thc combination ofa magncthavinga normally open circuit, an armature thereto,a normally-cncrgized magnet normally in circuit with tho armature, an armature to said enorgizcd magnet; :icontacb-poiut therefor, a inagnet in circuit with said armature andcontactpointa nd adapted to be energized by the breaking of the circuit ollthe normally-energized magnet, an armature 37, a lever-arm'normally supported by said armaturo,a"camoraadapt 4E BEST AVA! ed to be operated by the release of said arm, a pivoted plate, a flexible connection between said plate and the lever-arm, a friction-surface to the plate, material adjacent to the friction-surface adapted t0 be ignited by the movement thereof, and a flash-light cartridge adjacent to said material.
L ABLE COPE CHARLES P. COLLINS, ROBERT E. BAKER
US1121500A 1900-04-02 1900-04-02 Electric burglar-alarm. Expired - Lifetime US665801A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474757A (en) * 1945-06-04 1949-06-28 Sebastiano D Amico Burglary or fire alarm system
US2479528A (en) * 1946-09-23 1949-08-16 Villalobos Jose Petronilo Fire alarm
US2522615A (en) * 1945-04-03 1950-09-19 Ralph L Hughes Alarm system
US2709251A (en) * 1951-08-02 1955-05-24 Kenneth H Schmidt Audio electromagnetic capacity alarm device
US2966248A (en) * 1950-05-20 1960-12-27 John W Armbruster Servicing devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522615A (en) * 1945-04-03 1950-09-19 Ralph L Hughes Alarm system
US2474757A (en) * 1945-06-04 1949-06-28 Sebastiano D Amico Burglary or fire alarm system
US2479528A (en) * 1946-09-23 1949-08-16 Villalobos Jose Petronilo Fire alarm
US2966248A (en) * 1950-05-20 1960-12-27 John W Armbruster Servicing devices
US2709251A (en) * 1951-08-02 1955-05-24 Kenneth H Schmidt Audio electromagnetic capacity alarm device

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