... surface 2.metal marking machine 3.pin marking machine 4.marking on the mechanical part Marking Surface: Flat surface or curved ... , Piston, Cylinder Sleeve, etc.(2) Mechanical Industry: to marking on Mechanical Part, Machine tool, Hardware Product, Steel Tube, Sleeve, ... Valve and Fastener, etc.(3) To mark on Apparatus, Elector-mechanical instrument.(4) To mark on Plastic and Leather product. (5) To ...