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S.O.H.C. five valve engine
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Patent number 5,398,649
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Issue date Mar 21, 1995
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Yamaha Hatsudoki Kabushiki Kaisha
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Makoto Shimamoto
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Single overhead cam multi-valve engine
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Patent number 5,359,974
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Issue date Nov 1, 1994
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Yamaha Hatsudoki Kabushiki Kaisha
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Kenichi Nonogawa
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Single overhead cam multi-valve engine
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Patent number 5,291,868
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Issue date Mar 8, 1994
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Yamaha Motor Co. Ltd.
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Kenichi Nonogawa
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Cooling arrangement for multi-valve engine
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Patent number 5,081,960
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Issue date Jan 21, 1992
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Yamaha Hatsudoki Kabushiki Kaisha
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Makoto Shimamoto
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS