Title:
Shearing device and method for use in well drilling
United States Patent 2919111


Inventors:
Nicolson, Kingsley M.
Application Number:
US55668555A
Publication Date:
12/29/1959
Filing Date:
12/30/1955
Assignee:
CALIFORNIA RESEARCH CORP
Primary Class:
Other Classes:
72/326, 83/623, 83/639.1, 137/560, 166/55, 166/298, 166/361, 166/363, 166/364, 175/9, 251/1.3
International Classes:
E21B29/08; E21B33/06; E21B33/064
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