Title:
Systems and structures for controlling the movement of well pipe in well bores
United States Patent 2758654


Inventors:
Simmons, Drury M.
Application Number:
US37342253A
Publication Date:
08/14/1956
Filing Date:
08/10/1953
Assignee:
Simmons, Drury M.
Primary Class:
Other Classes:
166/380
International Classes:
E21B19/00
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