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NG FRED W
US
2 patents
Patents
2 patents
US4968098A
Nov 6, 1990
Coal seam discontinuity sensor and method for coal mining apparatus
ATLANTIC RICHFIELD CO
70 citations
92
US4965774A
Oct 23, 1990
Method and system for vertical seismic profiling by measuring drilling vibrations
ATLANTIC RICHFIELD CO
80 citations
92