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Switches and keyboards
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Patent number 4,839,474
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Issue date Jun 13, 1989
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Key Innovations Limited
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Richard P. Hayes-Pankhurst
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H01 - BASIC ELECTRIC ELEMENTS
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Compact electronic device
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Patent number 4,801,768
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Issue date Jan 31, 1989
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Casio Computer Co., Ltd.
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Kazuhiro Sugiyama
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H01 - BASIC ELECTRIC ELEMENTS
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Compact electronic device
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Patent number 4,680,432
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Issue date Jul 14, 1987
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Casio Computer Co., Ltd.
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Kazuhiro Sugiyama
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H01 - BASIC ELECTRIC ELEMENTS
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Switches and keyboards
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Patent number 4,634,818
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Issue date Jan 6, 1987
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NPM International
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Richard P. Hayes-Pankhurst
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H01 - BASIC ELECTRIC ELEMENTS
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3796843
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Patent number 3,796,843
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Issue date Mar 12, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3760360
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Patent number 3,760,360
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Issue date Sep 18, 1973
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G06 - COMPUTING CALCULATING COUNTING