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Preload piston actuator
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Patent number 5,996,417
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Issue date Dec 7, 1999
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Team Corporation
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Douglas A. Lund
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Electrohydraulic valve system
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Patent number 4,437,385
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Issue date Mar 20, 1984
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Deere & Company
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Kenneth D. Kramer
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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3619544
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Patent number 3,619,544
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Issue date Nov 9, 1971
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3521021
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Patent number 3,521,021
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Issue date Jul 21, 1970
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3221501
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Patent number 3,221,501
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Issue date Dec 7, 1965
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL