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Key switch
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Patent number 5,512,722
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Issue date Apr 30, 1996
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SMK Corporation
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Kumio Ozeki
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H01 - BASIC ELECTRIC ELEMENTS
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Key unit of a keyboard
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Patent number 5,456,541
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Issue date Oct 10, 1995
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Liao Ching-Shui
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Membrane switch
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Patent number 5,132,496
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Issue date Jul 21, 1992
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Acer Inc.
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Keh-Houng Lee
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H01 - BASIC ELECTRIC ELEMENTS
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Push-button switch
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Patent number 4,831,223
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Issue date May 16, 1989
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Jelco Co. Ltd.
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Soichi Wako
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H01 - BASIC ELECTRIC ELEMENTS
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Push button switch
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Patent number 4,755,645
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Issue date Jul 5, 1988
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Oki Electric Industry Co., Ltd.
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Kunimine Naoki
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H01 - BASIC ELECTRIC ELEMENTS
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Coil spring for key switch
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Patent number 4,733,036
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Issue date Mar 22, 1988
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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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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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