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Three-way poppet valve with hollow stem
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Patent number 4,915,134
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Issue date Apr 10, 1990
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Humphrey Products Company
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Vytautas J. Toliusis
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Single-stem four-way valve
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Patent number 4,823,842
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Issue date Apr 25, 1989
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Humphrey Products Company
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Vytautas J. Toliusis
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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Snap-together modular manifold construction
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Patent number 4,524,807
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Issue date Jun 25, 1985
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Humphrey Products Company
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Vytautas J. Toliusis
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Plunger-type valve
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Patent number 4,501,299
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Issue date Feb 26, 1985
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Humphrey Products Company
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Michael A. Klimowicz
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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