... plating,electrophoresis, polishing,Aluminum color Multi-functional High speed electronic engraving machine is one of used specific liquid that to ... patent of invention 01105380.1 etc, via of testing report from National product quality & control bureau: NPQC No.3. 200150013, ... metal engraving machine: you can make your own choice for engraving any picture on it. with high precision, high speed, lower ...