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US3304872A
|
|
Sealing means
|
|
US3256826A
|
|
Subsurface pump unit
|
|
US3222994A
|
|
Fluid motor
|
|
US3120812A
|
|
Free pump control system
|
|
US3204535A
|
|
Reciprocating fluid motor
|
|
US3135210A
|
|
Hydraulic pressure boosting device
|
|
US3109379A
|
|
Subsurface pump
|
|
US3102426A
|
|
Pressure fluctuation recorder
|
|
US3024733A
|
|
Subsurface fluid-operated pump
|
|
US3112646A
|
|
Variable orifice flow indicator
|
|
US2988005A
|
|
Subsurface hydraulic pump assembly with reverse flow
|
|
US2943576A
|
|
Oil well pump
|
|
US2983227A
|
|
Fluid pressure operated engine for well pumps
|
|
US2917000A
|
|
Subsurface hydraulic pump assembly
|
