| 3032065 | Pneumatic cylinder control | |||
| 2990816 | Pressure fluid operated pumping mechanism | |||
| 2612142 | Pump jack valve control mechanism | |||
| 2560676 | Pneumatic-hydraulic system for well pumping or drilling units | |||
| 2490323 | Fluid operated pumping mechanism | |||
| 2466375 | Automatic shutoff valve for fluid pressure operated devices | |||
| 2408075 | Oil well pump | |||
| 2366777 | Hydraulic lifting mechanism | |||
| 2232449 | Hydraulic pump | |||
| 2045945 | Fluid motor | |||
| 2019353 | Hydraulic pumping apparatus | |||
| 1619474 | Pumping system | |||
| 0856709 | N/A |