United States Patent 3212406
Inventors:
Mcduffie, Thomas F.
Publication Date:
10/19/1965
Assignee:
YOUNGSTOWN SHEET AND TUBE CO
Other Classes:
91/306, 417/904, 417/403, 91/235
International Classes:
F01L25/06; F04B9/125; F04B47/04; F01L25/00; F04B9/00; F04B47/00
US Patent References:
| 2612142 | Pump jack valve control mechanism | | | |
| 3032065 | Pneumatic cylinder control | | | |
| 1619474 | Pumping system | | | |
| 2019353 | Hydraulic pumping apparatus | | | |
| 2232449 | Hydraulic pump | | | |
| 2408075 | Oil well pump | | | |
| 2560676 | Pneumatic-hydraulic system for well pumping or drilling units | | | |
| 2990816 | Pressure fluid operated pumping mechanism | | | |