74063427
May 29, 1990
Dec 8, 1992
oilfield chemicals and chemical compositions; namely, additives for use in the drilling, completion and workover of oil and gas wells, corrosion inhibitors and wax solvents
Chemicalsoilfield downhole tools and equipment; namely, drill bits, threaded tubular connections, downhole motors, packers, perforation and completion tools and downhole production pumps
Machineryindustrial and municipal process treatment equipment; namely, waste water treatment equipment, pumping apparatus, and liquid/solid sedimentation and separation equipment
Environmental Control Apparatus