ELECTRIC GENERATORS; STRUCTURAL PARTS OF ELECTRIC GENERATORS; COMPRESSORS FOR MACHINES; AIR COMPRESSORS; AND PISTON AIR COMPRESSORS, AIR-POWERED HAMMERS, AIR-POWERED SCREW DRIVERS, AIR-POWERED DRILLS, AIR-POWERED RIVET HAMMERS, AIR-POWERED IMPACT WRENCHES, AIR-POWERED RATCHET WRENCHES, AIR-POWERED GRINDERS, AIR-POWERED SAWS, AND AIR-POWERED ORBITAL SANDERS