Title:
Pressure-proportioning device
United States Patent 2959225
US Patent References:
Manual multiway valve
- - 2633324

Drill stem tester
- - 2813587


Inventors:
Roberts, Alan P.
Publication Date:
11/08/1960
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Assignee:
JERSEY PROD RES CO
Primary Class:
166/147
Other Classes:
166/319, 166/191, 166/187
International Classes:
E21B33/124; E21B33/12