4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

William P. Buyak

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Electronic alarm horn

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Electronic circuits for driving bells or electromagnetic devices

Electrical transmission or interconnection systems – Plural supply circuits or sources – Selective or optional sources
Patent

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Piezo electronic horn

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Solenoid operated doorbell

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

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Strobe alarm circuit

Communications: electrical – Systems – Periodic or flashing
Patent

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Profile ID: LFUS-PAI-P-433436

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