37 General building contractor services for millwrighting, electrical, piping, heavy rigging, sheet metal, HVAC installation and repair, structural construction in the nature of construction of buildings for others, building maintenance, and construction of structural steel installations; repair and reconditioning of used electric motors, servo motors, winches and pumps; rental of construction equipment, namely, namely, rental of forklifts, man lifts, cranes, jacking towers, and telehandlers; tool rental services, namely, rental of small construction tools; self-performance of construction skilled trades, namely, construction, logistics, manufacturing, millwrighting, rigging, electrical, piping, HVAV, sheet metal, fabrication, transportation, hydraulics and pneumatics