Air Powered Hoists; Air Powered Rammers and Ramming Heads Therefor; Pneumatically Powered Screwdrivers, Impact Wrenches, Nut Runners, Drill Threaders, Tappers and Torque Wrenches; Air Powered Chipping Hammers, Chippers, Needle Scalers, and Chisels, Needles, and Punches Therefor; Air Powered Hammer Riveters and Rivet Busters and Rivet Cutters Therefor; Air Powered Squeeze Riveters, and Rivet Sets, Yokes and Yoke Cylinders Therefor; Air Powered Straight and Angle Grinders, Die Grinders, and Parts Therefor-Namely, Polishing Heads, Grinding Wheels, Sanding Discs and Back Up Pads, Cut Off Wheels, Wheel Guards and Rotary Wire Brushes; Parts for All the Aforesaid Power-Operated Tools-Namely, Air Motors, Handles, Clamps, Mounting Brackets, Columns, Chucks, Collets, Tool Holders, Drill Heads, Tapping Heads and Gear Sockets; Air Pressure Regulators for Pneumatic Tools