Title:
Well signaling system
United States Patent 2354887

Inventors:
Daniel, Silverman
Fearon, Robert E.
Publication Date:
08/01/1944
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Assignee:
STANOLIND OIL & GAS CO
Primary Class:
340/854.600
Other Classes:
324/369, 340/854.500, 175/50
International Classes:
E21B47/12