... ,electrophoresis, polishing,Aluminum color Multi-functional High speed electronic engraving machine is one of used specific ... picture on it. with high precision, high speed, lower cost, no limit for the engraving ... the manufacturing of forming electrode for electric spark, 24 k gold and pure silver goods, forming of ... surface of metal, which forming on surface with 24 k gold, 18k gold, or imitated gold. ...