Crystal wafer etching treatment; Semiconductor sealing processing; Integrated circuit etching treatment; Wafer Foundry, namely, manufacture of semiconductor wafers for others; Metal cutting treatment; Metal polishing treatment; Metal forging treatment; metal tempering; Metal rust-resistant treatment, namely, applying protective coatings to metal by means of galvanization; metal plating; cadmium plating; chromium plating; galvanization; gold plating; nickel plating; silver plating; tin plating...