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US3636484A
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Springless switch constructions for use in the protective circuit of burglar alarm systems
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US3668582A
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Trap switch constructions in the normally closed protective circuit of burglar alarm systems
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US3516036A
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Magnetic shunt switches and the like
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US3569645A
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Tamperproof switch devices for burglar alarm systems, affording cordless connections across protected station separations
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US3541276A
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Electrical closure operated switch changeable between normally open and normally closed condition
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US3495054A
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Supply parts for making various plug and jack burglar alarm switch constructions
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US3495040A
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Security alarm system
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US3211460A
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Phonograph apparatus
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US3299523A
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Levels
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US3253831A
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Phonograph apparatus which operates in any position
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US3178188A
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Electrically-controlled phonograph apparatus
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US3105690A
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Selective phonograph apparatus
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US3109655A
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One-point control selective phonograph apparatus
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US3168318A
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Phonograph apparatus
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US3046978A
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Manually operated resuscitator
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US3005975A
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Warning, safety stop and distress signalling lights devices
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US3005421A
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High frequency ice cream dispenser gun device
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US2859325A
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Electrical ice cream dispensing gun device
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CA643871A
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Electrical ice cream dispensing gun device
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