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Keyboard switch
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Patent number 4,678,880
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Issue date Jul 7, 1987
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Omron Tateisi Electronics Co.
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Haruyuki Koizumi
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H01 - BASIC ELECTRIC ELEMENTS
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Key switch
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Patent number 4,659,879
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Issue date Apr 21, 1987
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Topre Corporation
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Hiroshi Hasegawa
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H01 - BASIC ELECTRIC ELEMENTS
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3900712
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Patent number 3,900,712
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Issue date Aug 19, 1975
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3773997
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Patent number 3,773,997
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Issue date Nov 20, 1973
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS