Main business blank： research and development;Compressed air conveying pipe materials, pipe fittings and valves production and marketing;Installation of pressure piping and pressure vessels;Weak production and sales of mechanical equipment and machinery;
Main business blank：ceramic glaze research and development; ceramics and their products, aluminum hydroxide, alumina and alumina products, zirconia and zirconia products, chemical products and raw materials, refractories, ceramic materials, mechanical and electrical pro
