73803057
May 30, 1989
CHEMICALS AND CHEMICAL COMPOSITIONS, NAMELY ADDITIVES FOR USE IN THE DRILLING, COMPLETION AND WORKOVER OF SUBTERRANEAN OIL AND GAS WELLS
ChemicalsLUBRICANTS, NAMELY LUBRICANTS FOR USE IN DRILLING; COMPLETION AND WORKOVER FLUIDS FOR SUBTERRANEAN WELLS
Lubricants and FuelsSERVICES, NAMELY TECHNOLOGY SERVICES FOR PREPARING, MAINTAINING AND MONITORING DRILLING, COMPLETION AND WORKOVER FLUIDS FOR SUBTERRANEAN WELLS
Computer and Scientific