Well logging apparatus and method thereof
United States Patent 2309835

Inventors:
Earl, Fearon Robert
Publication Date:
02/02/1943
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Assignee:
WELL SURVEYS INC
Primary Class:
175/4.510
Other Classes:
250/261, 175/4.550, 166/242.400, 89/1.150
International Classes:
E21B43/116; F42D1/05; G01V5/12; E21B43/11; F42D1/00; G01V5/00