The manufacture, renovation and repair of machinery and equipment, except electrical machinery, not elsewhere classified, such as pumps, air and gas compressors; blowers, air conditioning and ventilating machinery; fire sprinklers; refrigerators and equipment; mechanical power transmission equipment; lifting and hoisting machinery, cranes, elevators, moving stairways, industrial trucks, tractors, trailers, and stackers; sewing machines; small arms and accessories, heavy ordinance and artillery; industrial process furnaces and ovens; automatic merchandising machines; washing, laundry, dry cleaning and pressing machines; cooking ranges and ovens; and other service industry machines. Included are manufacture of general purpose parts of machinery, such as ball and roller bearings, piston rings, valves; and shops engaged in manufacturing, rebuilding or repairing

various kinds of machinery and equipment and associated parts and accessories on a job or order basis for others.