construction machines, namely, excavating machines, power-operated impact hammers for foundation work, augers, pile-drivers, pile-extractors; compactors, earth compacting machines, power operated earth tampers; earth moving machines, namely graders, bulldozers, power hydraulic rammers, concrete mixers, concrete vibrators, concrete pneumatic pumps, asphalt paving machines, and dredging machines; loading and unloading machines, namely cranes, conveyors, hoisting and winding gears as parts of cranes; moving sidewalks, escalators; power jacks; unloading hoppers; machine operated platforms capable of elevation above ground level and used for storage; mining machines, namely milling cutters, crawler-tracked loaders, coal cutting machines, oil-well pumping machines, rock drills, well drilling machines, mine drill sharpeners, mine borers, coal loaders, truck mills and coal ploughs; agriculture machines, namely plows, power operated cultivators, harvesters, plant fiber processing machines, fodder presses, feed cutters, feed mixers and cake-fodder crushing machines, namely feed mills; machine parts for the above namely axles, spindles, roller bearings, shaft couplings, shaft connectors, shock absorbers, springs, brakes, ball valves and power transmissions and gearing for machines