Engineering and metal processing
Voltaic and electrochemical production sites, factories, plants, and lots. Processes: degreasing, pulverization, etching, bonderization, oxidation, anodizing, bichromate processing, processing in chromium anhydride, nickeling, chromizing, copperizing, tinning, lodging of tin-bismuth alloys, zincking, zinc anodization, cadmium coating, cadmium-tin alloy coating, brassing, leading, gilding, silvering, palladizing, electrolytic polishing, chemical polishing, and removal of copper, nickel, chrome, and tin.