23 TUBE FORMING MILLS, CUT-OFF MACHINES, PRESS-TYPE CUT-OFF MACHINES, AUTOMATIC FLYING CUT-OFF MACHINES, [ SLITTING MACHINES, METAL TRIMMING MACHINES, GANG SLITTING MACHINES; ] AUTOMATIC, UNITARY METAL FEEDING, FORMING, WELDING AND CUT-OFF APPARATUS; [ SCRAP CUTTING MACHINES, ] PUNCHING MACHINES, STRAIGHTENING AND SIZING MACHINES, [ METAL LEVELING MACHINES, ] SHEET METAL COILING AND UNCOILING MACHINES, SHAPING AND ROLLING MACHINES, POWER DRIVEN SAWS, [ ROLL GRINDING MACHINES, ] POWER OPERATED HAMMERS, BURR REMOVING TOOLS, SHEAR TYPE CUTTING MACHINES, [ SHEET METAL EDGE CONDITIONING AND TRIMMING MACHINES, CONTINUOUS MATERIAL MIXING MACHINES, BATCH MATERIAL MIXING MACHINES, ] METAL STRIP BENDING AND SHAPING MACHINES, SHEET METAL EMBOSSING MACHINES, MACHINES FOR ROLLING STRUCTURAL MEMBERS, MACHINES FOR BENDING METAL STRIPS INTO RING AND SPIRAL SHAPE, MACHINES FOR WINDING BURRS