Earth borehole logging system
United States Patent 2890019

Inventors:
Arps, Jan J.
Publication Date:
06/09/1959
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Assignee:
Arps, Jan J.
Primary Class:
175/50
Other Classes:
73/152.010, 324/323, 175/325.200
International Classes:
E21B17/10; E21B41/00; E21B47/18; E21B17/00; E21B47/12
US Patent References:
2700131Measurement system
2715552Drill string bushing tool