37 Repair and maintenance of heavy equipment and industrial equipment for use in building construction, mining, earth and materials handling and moving, road building and paving, agriculture, utilities, waste handling, pipe laying, and timber harvesting, power operated forklifts and other lifting and moving equipment, floor cleaning machines, road sweeping machines, diesel and electric generators, switchgears, marine vessel engines, on-highway trucks, buses, and trailers; Leasing of heavy equipment and industrial equipment for use in building construction, mining, earth moving, road building and paving, construction of utilities, pipe laying, floor cleaning machines, and road sweeping machines