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US2751767A
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Combination free swivel and controlled torque joint
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US2764940A
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Oil well pump with diluent delivery means
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Crown and traveling block lubrication system
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Oil well drilling drawworks
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Drawworks having selective transmission and control
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Split packing cartridge
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Swivel connection for fluids
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Rotary machine with slip operating mechanism
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Reciprocating rod packing
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Polish rod packing device
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Air brake for drawworks
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Compounding transmission and clutch assembly therefor
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Direct air friction cathead
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Cross-head connection
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US2678609A
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Lubricating and sealing means
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