7 construction machines and equipment, namely, sludge, slurry, plaster, mortar, fireproofing and concrete pumps, equipped with conveying and placing booms, masts, conveyors and hoses - trailer, truck or skid mounted; lift platforms with folding sectional booms - trailer, truck or skid mounted; power operated concrete placing booms; concrete mixers - trailer, truck or skid mounted; concrete curbing machines; concrete forming machines; machines for batching, mixing and conveying concrete; aggregate feeding conveyors; rock, sand and gravel washing and screening machines; concrete recycling machines; road making machines, namely, slipform pavers and placers; and parts therefor