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FR2567344A1
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Amplified listening and amplifying telephone set
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FR2466091A2
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Pushbutton switch for keyboard - has tilted movable ring contact with depending leaf contacts engageable with contacts of PCB
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FR2466148A1
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SWITCHING MECHANISMS FOR A KEYBOARD, PARTICULARLY FOR NETWORK AND PRIVATE KEYS OF A TELEPHONE INTERCOMMUNICATION STATION
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FR2430076A1
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Pushbutton switch for telephone set - has upper contact with central section resting on insulating lug on lower contact
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GB1531299A
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Push-button switch device for a multifrequency dialling telephone set
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FR1533968A
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Advanced telephone intercom device
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FR948845A
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Improvements to speakerphone systems
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FR935279A
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Development of speakerphone telephony devices
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US2293372A
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Means for amplifying mechanical vibrations
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