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Oil change system and method
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Patent number 5,246,086
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Issue date Sep 21, 1993
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Henry Yunick
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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Internal combustion engine
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Patent number 4,467,752
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Issue date Aug 28, 1984
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MotorTech, Inc.
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Henry Yunick
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Pressure vent
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Patent number 4,068,635
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Issue date Jan 17, 1978
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Henry Yunick
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS