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Electric alarm device

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric alarm siren with arc-like runner legs

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

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Electric apparatus for displaying a plurality of key symbols on

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

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Electric bell having a mechanism for supporting electromagnetic

Communications: electrical – Audible indication – Electronic
Patent

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Electric horn

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with improved pole piece and adjusting cap

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with improved striker assembly

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with means for controlling curvature of the strike

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with solid state driver

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with solid state driver

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horn with twin driving electromagnets

Communications: electrical – Audible indication – Diaphragm
Patent

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Electric horns

Communications: electrical – Audible indication – Diaphragm
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Electric puke code modulation encoding arrangements

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

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Electrical apparatus and method for electrically simulating a no

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Electrical assembly

Communications: electrical – Audible indication – Diaphragm
Patent

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Electrical encoding device

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

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Electrical noise generation circuits for use in conjunction with

Communications: electrical – Audible indication – Simulation
Patent

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Electrical simulation of percussive bell

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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Electrical synthesis of mechanical bell

Communications: electrical – Audible indication – Ultrasonic pest control
Patent

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