37 Installation, maintenance, repair and refurbishing of waste equipment, namely, truck bodies used to haul garbage, refuse, and detachable containers; Installation, maintenance, repair and refurbishing of waste equipment, namely, waste compactors, hydraulic lifters attached to garbage trucks and containers, and structural parts and accessories of trucks, compactors, and containers; installation, maintenance, repair and refurbishing of concrete and cement mixing trucks and structural parts and accessories therefor