Sand-blasting apparatus; Power tools, namely, thread mills; Power-operated tools, namely, grinders; Air powered tools, namely, drills, screwdrivers, rivet hammers, saws; Power-operated grinding wheels; Power tools, namely, drills, routers, circular saws; Power drills; Chains for chain saws; Nozzles for particle blast cleaning machines and structural parts thereof; Nail extractors, electric