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Encoded keyboard switch
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Patent number 4,450,324
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Issue date May 22, 1984
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AMP Incorporated
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Kazutoyo Fukukura
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard switch covering pads
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Patent number 4,289,940
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Issue date Sep 15, 1981
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Shin-Etsu Polymer Company, Ltd.
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Ryoichi Sado
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H01 - BASIC ELECTRIC ELEMENTS
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3721778
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Patent number 3,721,778
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Issue date Mar 20, 1973
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H01 - BASIC ELECTRIC ELEMENTS