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US3192797A
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Apparatus and method for counter-balancing a weight balanced reciprocating machine
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US2934169A
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Piston lubricating means
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US2945399A
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Automatic counterbalance
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US2772751A
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Piston lubricator and cylinder dust guard
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US2709630A
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Piston ring
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US2671356A
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Pneumatic time compensator
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US2651945A
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Hydraulic time compensator
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US2665901A
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Lubricating system for units operated by compressed air
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US2665774A
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Piston lubricating means
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US2626193A
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Frangible piston ring
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US2576765A
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Eccentric crank pin mounting
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US2464710A
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Compensating piston lubricator
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US2456531A
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Setback means for pumping units
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US2654531A
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Air compressor
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US2344787A
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Antipound pump pressure equalizer
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US2344786A
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Antipound pump pressure equalizer
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US2275919A
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Crank balanced unit
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US2314595A
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Gear unit
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US2222205A
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Fluid lift pump
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US2169815A
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Well pump operating mechanism
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