37 repairing, servicing, rebuilding and reconditioning snow plows, snow blowers, harnesses for mounting snow plows and blowers on vehicles, vehicle components and parts associated with snow and ice control, vehicle dump bodies, dump body hoists, material spreaders for sand, salt and the like for control of snow and ice on roads, hydraulic pumps, valves, cylinders and circuits, fabricated structural steel, ornamental iron, platework, ductwork, hoppers and conveyors