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Tattle-tale apparatus
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Patent number 8,887,799
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Issue date Nov 18, 2014
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Blackhawk Specialty Tools, LLC
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Ron D. Robichaux
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E21 - EARTH DRILLING MINING
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Pressure balanced ball valve
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Patent number 4,566,672
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Issue date Jan 28, 1986
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James F. Giebeler
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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High pressure swivel coupling
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Patent number 4,557,509
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Issue date Dec 10, 1985
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Emco Arrowhead
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James F. Giebeler
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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High pressure swivel joint
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Patent number 4,407,533
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Issue date Oct 4, 1983
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Arrowhead Continental
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James F. Giebeler
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...