Air valves, pumps, compressors and compressor control units, crust breakers, hoists and hoist controls, saw mill carriage feeds, air and gas motors, hose trolleys, chain baskets, mining equipment including drill steel rods and couplings, drill sharpeners, drill bits, mine car loaders, rock drill units, feed legs and feeding units, shaft muckers, hole punchers, drill mountings and supports, wagon rigs, portable motorized drill carriages; and power-operated industrial tools including bench and sandrammers, boring tools, buffers and burring, chipping hammers, chisels, clay and trench diggers, concrete finishers, core and concrete breakers, drill feeding units, drill speeders, drills, filing tools, grinders and polishers, tampers, nut setters, ratchet and impact wrenches, rivet cutters and busters, vibrators, sanders, screw drivers and bits, spot facers, tab twisters, tappers, Riveters, sawing tools, lint pickers, ring formers and tools for conecting wires to terminals; balancers and thread gauging tools; coolers and filters; and fans, all being goods in the nature of machines or parts of machines,