73091469
Jun 24, 1976
Aug 22, 1978
OIL FIELD PRODUCTS-NAMELY, OIL WELL DRILLING AND TREATING, COMPOSITIONS AND FLUIDS, AGGREGATES, ADDITIVES, WEIGHTING, CONDITIONING AND FILTRATE REDUCING AGENTS, VISCOSIFIERS, LOST CIRCULATION MATERIALS COMPRISING COMPOSITIONS CONTAINING GRANULES, FLAKES, SHREDDED FIBERS AND GROUND NUT SHELLS FOR MIXING WITH DRILLING FLUIDS
Chemicals