Pickling, namely, metal treating; burnishing by abrasion; strip electroplating; chromating, namely, chromium plating; milling, namely, millworking; electroplating; rack electroplating; gold plating; engraving; hardening of metals; cadmium plating; plastic electroplating; metalworking; plating by electrolysis, namely, electro-plating; plating of metals; polishing by abrasion, namely, metal treating; barrel electroplating; chrome plating; nickel plating; silver plating; tin plating; water treat...