Metal treatment, namely metal treatment of perforated plates and perforated sheets; metal casting of perforated plates and perforated sheets; metal finishing of perforated plates and perforated sheets; metal treatment of perforated plates and perforated sheets, namely stamping, pressing, hardening, forming, forging, machining, cutting and embossing; surface treatment and coating, namely by metal deposition processes as well as chemical, electrical and electrochemical treatment of perforated p...