Precious metal plating; gold plating; metal plating and laminating; exterior and interior metal plating of pipes and tubes made of metal; metal plating; metal galvanization; hard chromium plating and hard nickel plating of metal surfaces; hard nickel plating of metal surfaces; hard chromium plating of metal surfaces; nickel plating; ruthenium plating; zinc plating; hot dipping; silver plating; electroplating; tin plating; cadmium plating; chromium plating; metal alloy plating