Pumping systems
United States Patent 3212406

Inventors:
Mcduffie, Thomas F.
Publication Date:
10/19/1965
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Assignee:
YOUNGSTOWN SHEET AND TUBE CO
Primary Class:
91/165
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:
2612142Pump jack valve control mechanism
3032065Pneumatic cylinder control
1619474Pumping system
2019353Hydraulic pumping apparatus
2232449Hydraulic pump
2408075Oil well pump
2560676Pneumatic-hydraulic system for well pumping or drilling units
2990816Pressure fluid operated pumping mechanism