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Valve construction
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Patent number 6,016,838
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Issue date Jan 25, 2000
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Mead Fluid Dynamics, Inc.
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Richard Wigmore
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Cartridge valve
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Patent number 4,787,412
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Issue date Nov 29, 1988
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Hagglunds Denison
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Richard Wigmore
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Dual pilot counterbalance valve
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Patent number 4,338,856
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Issue date Jul 13, 1982
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Abex Corporation
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Robert Smilges
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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