Title:
Derrick
United States Patent 1693107


Inventors:
Campbell, Thomas F.
Application Number:
US11900526A
Publication Date:
11/27/1928
Filing Date:
06/28/1926
Assignee:
Richard, Shannon S.
Primary Class:
Other Classes:
52/40, 182/179.1, 254/394
International Classes:
E21B15/00; E04H12/24
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