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Pilot valve
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Patent number 4,664,135
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Issue date May 12, 1987
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Sanders Associates, Inc.
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Paul F. Hayner
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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Single stage hydraulic valve
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Patent number 4,325,412
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Issue date Apr 20, 1982
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Sanders Associates, Inc.
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Paul Hayner
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Low noise hydraulic servo valve
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Patent number 4,050,476
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Issue date Sep 27, 1977
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Sanders Associates, Inc.
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Paul F. Hayner
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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Fluid actuated gyroscope
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Patent number 4,024,769
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Issue date May 24, 1977
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Sanders Associates, Inc.
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Paul F. Hayner
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G01 - MEASURING TESTING
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