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on 03 Apr 1987
ROTARY DRILLING SERVICES, INC.
72244742 · 02 May 1966
001
QUICK SEAL,MIXTURE OF VEGETABLE FIBERS, SYNTHETIC FIBERS, CELLOPHANE F...
on 22 Sep 1985
ROTARY DRILLING SERVICES, INC.
72161376 · 24 Jan 1963
006
SURFACE TENSION REDUCING ADDITIVES FOR OIL WELL DRILLING FLUIDS,SURFAC...
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