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US5584353A
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Well jar accelerator with expansion chamber
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US5501286A
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Method and apparatus for displacing a top drive torque track
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US5381867A
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Top drive torque track and method of installing same
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US5388651A
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Top drive unit torque break-out system
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US5163513A
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Circle threadform for marine riser top joint
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US5251493A
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Load cell for well tubulars or the like
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US4877217A
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Fail-safe blowout preventer
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US4842058A
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Load detection and indicator apparatus for well tubing or the like
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US4793410A
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Load detection and indicator apparatus for well tubing or the like
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US4706745A
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Lock-down releasing spear assembly
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US4715456A
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Slips for well pipe
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US4648447A
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Casing scraper
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US4558842A
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Connector for joining blowout preventer members
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US4398729A
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Blowout preventer inner ram seal assembly
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US4387885A
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Shock absorber assembly for absorbing shocks encountered by a drill string
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US4456215A
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Inner seal and support rod assembly for high pressure blowout preventers
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US4439167A
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Shock absorber assembly
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US4369977A
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Seal for an overshot and a method of doing same
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US4331006A
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Shock absorber assembly
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US4332062A
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Bowl structure
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