4. Communications: electrical
  5. Audible indication
  6. Pneumatic-type sound producer
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Security alarm system

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

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Security alarm system with audio monitoring capability

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

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Security interlock switch system for smoke detectors and the lik

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

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Siren

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

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Siren with remote driver

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

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Small siren having protective screen

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

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Sound generator for a kite

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

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Supervisory circuit for parallel connected devices

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

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System monitor with innate line security ability

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

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