4. Communications: electrical
  5. Systems
  6. Call station

Charles Berns

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Buzzer construction and method of adjusting the same

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

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Control circuit for electromagnetic transducer

Oscillators – Relaxation oscillators
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Smoke detector

Communications: electrical – Systems – Call station
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Profile ID: LFUS-PAI-P-1183804

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