4. Communications: electrical
  5. Audible indication
  6. Diaphragm
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Buzzer

Communications: electrical – Audible indication – Diaphragm
Patent

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Buzzer with a sound film and equalizing or whirlpool sound mecha

Communications: electrical – Audible indication – Diaphragm
Patent

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Buzzer with rigid electrical leads

Communications: electrical – Audible indication – Diaphragm
Patent

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Buzzer with rotary volume adjustment

Communications: electrical – Audible indication – Diaphragm
Patent

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