Jewelry manufacturing; Jewelry wholesale; Jewelry recycling and repair service; Smelting of common non-ferrous metals; Hardware products manufacturing; Wholesale of hardware products; Retail of hardware products; Manufacturing of arts and crafts and ceremonial articles (excluding ivory and its products); Sales of arts and crafts products and etiquette supplies (excluding ivory and its products); Wholesale of arts and crafts and collectibles (excluding ivory and its products); Retail of arts and crafts and collectibles (excluding ivory and its products); Identification and evaluation services for art (American) art products and collections; Precious metal smelting; Metal cutting service; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Clock sales; Manufacturing of clocks and timekeeping instruments; Sales of clocks and timekeeping instruments; Repair of metal products; Sales of metal products; Sales of metal chains and other metal products; Manufacturing of special equipment for daily necessities production; Technology import and export; Import and export of goods