Portable earth drilling machines and machine parts, namely, slim hole drills, exploration drills, core drills, seismograph shot hole drills, water well drills, slush pumps, water swivels, traveling blocks, kelly rods, drive bushings, drill pipe slips, core drill and exploration drill pipe, drill pipe substitutes, core barrels and bits, drilling bits, fishing tools for locating stray drilling equipment, rotary tables, power take-offs, drill pipe elevators and spiders, pull-down chucks, hoisting plugs, drill heads, drawworks, drill pipe and tool joints, swivel stems, and shifter sleeves; oil-well pumping machines, namely, high-pressure, high-volume fluid pumper for fracturing, cleaning, and stimulating natural gas or petroleum wells; drilling rig mechanization machines and devices, namely, rack and pinion, tophead drive [ potable ] * portable * drilling rigs for the oil and gas, geothermal and other related markets; industrial drilling and oil and gas drilling mud cleaning machines, primarily comprised of a mud/slurry hopper and mixer, pumps, settling tanks, vibrating screens and cone separators, operating as a unit