... 01 3 10638.4, patent of invention 01105380.1 etc, via of testing report from National product ... SH(YWJ)No.059.Its versatility as follows: 1, Work as one of metal engraving machine: you ... choice for engraving any picture on it. with high precision, high speed, lower cost, no limit for the engraving ... the laser engraving products,but only less than 1/10 price compare with the laser engraving product, ...