... on the flat surface 2.metal marking machine 3.pin marking machine 4.marking on the mechanical part Marking Surface: Flat surface or curved surface ... to mark Manufacturing Number and Date, Company Name, Brand, etc. , on Vehicle Body, Frame, Base Plate, Pillar, Engine, ... Rod, Cylinder, Piston, Cylinder Sleeve, etc.(2) Mechanical Industry: to marking on Mechanical Part, Machine tool, Hardware Product, ...