Title:
Blowout closure device pressure head
United States Patent 2897895
Inventors:
Ortloff, John E.
Application Number:
US57500756A
Publication Date:
08/04/1959
Filing Date:
03/30/1956
Assignee:
JERSEY PROD RES CO
Primary Class:
Other Classes:
166/75.14, 285/10, 285/123.11, 285/308, 285/920
International Classes:
E21B33/04; E21B33/043; E21B33/06
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