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

Shigeo Shimoya

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A.C. alarm buzzer

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

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Alarm buzzer

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent

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Alarm buzzer

Communications: electrical – Audible indication – Diaphragm
Patent

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Alarm buzzer

Communications: electrical – Audible indication – Diaphragm
Patent

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Magnetic proximity switch

Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Plural magnets
Patent

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Profile ID: LFUS-PAI-P-260811

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