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US3047960A
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Method and apparatus for inspecting threads and cylinders
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US2663307A
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Washout sub for well packers
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US2540900A
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Tool joint
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US2244100A
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Actuating lever mechanism for reciprocating valve stems
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US2079922A
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Device for capping pump tubing
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US1907658A
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Rock bit cone wrench
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US1868757A
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Pipe cutter
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US1831878A
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Method of and apparatus for making emergency pipe connections
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US1814058A
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Internal pipe cutter
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CA777592A
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Well swab
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CA749824A
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Valve insert
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CA703911A
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Valve
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CA655966A
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Slush pump piston snap ring insertion
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CA658049A
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Drill pipe coupling
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CA654678A
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Pipe connection
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CA716895A
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Well swab
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CA685855A
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Integral tool joint drill pipe
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CA691256A
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Kelly bushing
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CA662706A
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Pump piston
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CA670628A
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Piston and piston ring
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