Title:
Well signaling system
United States Patent 3186222
US Patent References:
Well signaling system
- - 2354887

Borehole indicating apparatus
- - 2380520

Well logging
- - 2389241

Well signaling system
- - 2411696

Drill bit pressure gauge
- - 2422806


Inventors:
Martin, Philip W.
Publication Date:
06/01/1965
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Assignee:
MCCULLOUGH TOOL CO
Primary Class:
340/853.700
Other Classes:
73/152.010, 340/853.600, 340/854.400
International Classes:
E21B47/12; G01V3/34; G01V3/18
US Patent References:
2507351Transmitting of information in drill holes
2568241Apparatus for logging
2679757Apparatus for recording subsurface measurements
2685798Apparatus for measuring and indicating various conditions such as temperature and pressure
2883650System for reproducing a varying d. c. voltage at a distance
2930137Earth borehole crookedness detection and indication