23 CHAIN SAWS AND PARTS THEREFOR, POWDER ACTUATED STUD DRIVERS, CONCRETE VIBRATORS, SCREEDS, POWER TROWELS, MASONRY SAWS, COMPACTORS, RAMMERS, GRINDER SPINDLES, SANDBLASTERS, GROUTERS, CONCRETE PLACERS, CONCRETE GUNS, GROUT AND MORTAR PUMPS, CONCRETE PUMPS, PLASTER MIXERS, MATERIAL AND PERSONNEL HOISTS, FORK LIFT TRUCKS, TOWER CRANES, PIGGYBACK RAMPS, GANTRY CRANES, AND AUTOMOBILE LOADERS AND UNLOADERS