Manufacturing of glass fibers and products; Glass manufacturing; Manufacturing of technical glass products; Manufacturing of ordinary glass containers; Manufacturing of glass保温 containers; Manufacturing of optical glass; Manufacturing of daily-use glass products; Manufacturing of glass fiber reinforced plastic products; Sales of glass instruments; Sales of optical glass; Sales of technical glass products; Sales of glass fibers and products; Sales of daily-use glass products; Sales of functional glass and new optical materials; Sales of glass fiber reinforced plastic products; Manufacturing of unsealed glass envelopes and other glass products; Manufacturing of glass instruments; Manufacturing of specialized equipment for glass, ceramics, and enamel products; Manufacturing of doors and windows; Manufacturing of specialized machinery for building materials; Sales of doors and windows; Construction of metal doors and windows; Research and development of metal products; Sales of metal products; Manufacturing of hardware products; Retail of hardware products; Sales of building decoration materials; Manufacturing of building decoration, plumbing pipe fittings, and other building metal products; Furniture installation and repair services; Sales of building ceramic products; Sales of automotive decoration products; Sales of lightweight building materials; Sales of daily-use department store goods; Indoor wooden door and window installation services; Household appliance installation services; Residential water and electricity installation and maintenance services; Installation services for general mechanical equipment; Engineering management services; Contracting of foreign projects; Road freight transport for vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods); Import and export of goods; Import and export of technology; Import and export agency.