Title:
Methods and apparatus for exploring boreholes
United States Patent 2826736
Inventors:
Henri-georges, Doll
Application Number:
US50277755A
Publication Date:
03/11/1958
Filing Date:
04/21/1955
Assignee:
SCHLUMBERGER WELL SURV CORP
Primary Class:
Other Classes:
324/347
International Classes:
E21B47/10
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Foreign References:
FR673872A1930-01-21