Apparatus for determining inclination of well bores
United States Patent 2303360

Inventors:
Irwin, Emmett M.
Chenoweth, Ray M.
Duval, Richard H.
Publication Date:
12/01/1942
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Assignee:
COOPERATIVE DEV CO
Primary Class:
33/312
Other Classes:
340/870.160, 200/61.520, 175/45
International Classes:
E21B47/022; E21B47/02