Title:
Apparatus for perforating well casing and the like
United States Patent 2853944


Inventors:
Robertson, Harry S.
Application Number:
US20959851A
Publication Date:
09/30/1958
Filing Date:
02/06/1951
Assignee:
Borg, Warner
Primary Class:
Other Classes:
89/1.15
International Classes:
E21B43/117
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Foreign References:
GB645466A1950-11-01