Machines and machine tools for use in metal marking, etching and cleaning; welding machine accessories and structural parts thereof, namely, weld purging materials; weld cleaning machines; Metal marking and etching machines; metal polishing machines; machine tools for metal marking, etching and cleaning; brushes for use with machines, namely, rotary brushes for use with weld cleaning machines, metal marking and etching machines; printing machines for use on sheet metal; stencil cutting machin...