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Engine tachometer
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Patent number D366003
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Issue date Jan 9, 1996
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Oppama Industry Co., Ltd.
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Shigeo Take
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D10 - Measuring, testing, or signalling instruments
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Working machine safety device
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Patent number 5,240,428
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Issue date Aug 31, 1993
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Kioritz Corporation
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Hiroshi Nakata
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Diesel engine revolution counter
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Patent number 5,181,232
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Issue date Jan 19, 1993
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Oppama Kogyo Kabushiki Kaisha
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Shigeo Take
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS