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A.C. alarm buzzer

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Air horn assembly

Communications: electrical – Audible indication – Pneumatic-type sound producer
Reexamination Certificate

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Alarm detection and identification system

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Alarm system and remote monitor panel

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Alarm system including remote signalling means

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Anti-fraud alarm transmission line security system

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Apparatus for supervising leads interconnecting a plurality of s

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Apparatus generating noise sound for electric car

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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Audible alarm for a synchronous motor

Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent

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