Means and method for locating oil bearing sands
United States Patent 2206922

Inventors:
Smith, Alonzo L.
Publication Date:
07/09/1940
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Assignee:
Starr, Thayer
Primary Class:
175/41
Other Classes:
175/88, 175/206, 250/301, 166/242.400, 73/152.040
International Classes:
E21B47/04