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Membrane switch
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Patent number 6,144,003
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Issue date Nov 7, 2000
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SMK Corporation
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Osamu Kamishima
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard
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Patent number 5,969,320
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Issue date Oct 19, 1999
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NCR Corporation
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Kevin G. Leeper
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G07 - CHECKING-DEVICES
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Switch mat
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Patent number 5,874,700
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Issue date Feb 23, 1999
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Preh-Werke GmbH & Co. KG
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS
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Planar touch panel
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Patent number 4,467,151
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Issue date Aug 21, 1984
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Control Data Corporation
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Robert J. Johnson
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H01 - BASIC ELECTRIC ELEMENTS
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3898421
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Patent number 3,898,421
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Issue date Aug 5, 1975
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H01 - BASIC ELECTRIC ELEMENTS