Title:
Blowout preventer and ram therefor
United States Patent 2947508


Inventors:
Herbert, Allen
Application Number:
US57669656A
Publication Date:
08/02/1960
Filing Date:
04/06/1956
Assignee:
CAMERON IRON WORKS INC
Primary Class:
Other Classes:
251/212, 251/326, 277/325
International Classes:
E21B33/06
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US Patent References:
Foreign References:
AT76279B1919-04-25