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

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

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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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Buzzer with adjustable volume level

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

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