Machines for use in the production of oil and gas from wells and for the drilling of oil and gas wells, namely, derricks, drilling masts, off shore and on shore drilling rigs and work over rigs, machines that pump the oil and gas from the ground, and replacement parts therefor; machine tools, namely, blow out preventer handling systems comprised of lifting hoists and trolleys for operation on trolley beams; blow out preventer cranes; breakout machines; bumper subs; centrifugal pumps; coiled tubing equipment comprised of tubing hangers, tubing heads, work reels, hose reels, tubing reels, injector heads, injector head trolleys, control cabin and hydraulic power packs, carriers, trailers, masts, tubing grippers, lift chains, gripper blocks, block carriers, and pumps; machine parts, namely, chain links, cam rollers, level winds; cranes; crown blocks; deadline/wireline anchors; derricks; de-sanders; de-silters; dies and inserts; disc brakes for draw-works; down-hole motors; draw-works, namely, hoists; drilling jars; mud hoppers; mud guns; nitrogen pumping equipment comprised of pumps, carriers, and cryogenic pumps; pistons for slush pumps and well services pumps; platform rigs; plunger pumps; power swivels; reamers; rotary tables; safety valves; self propelled rigs; shakers; sheaves; shock tools used to isolate the oilfield drill string, namely, barrels, mandrels, spline drives, pistons, springs, and seals; skidding systems comprised of lift and roll components used to lift and roll the machines used to produce oil and gas from wells, rig jacks, claw and grippers; slips for drill pipes; drill collars, casing, and tubing; slurry pumps; slush pumps and mud pumps; solids controls equipment comprised of shale shakers, mud cleaners, de-grassers, de-silters, cones, mud agitators, mud hoppers, mud guns, mud mixers, shear relief valves, reset relief valves, float valves, and gate valves; spiders; stabilizers; substructures; swivels; machine parts, namely, rotary tongs; torque converters for machines; trailerized rigs; traveling blocks; slush pump valve seats; slush pumps; plunger pumps; well service pumps; machine parts, namely, wash pipes; well services pumps; winches; windlass, all being machines and machine tools for use in the production of oil and gas from wells and for the drilling of oil and gas wells

SCR systems, namely, silicone control rectifier electrical units for converting AC to DC for drilling rigs