SIN HENG KONG BENG

This sub-class includes treatment and coating of metals not elsewhere classified. Examples: - deburring, sandblasting, tumbling, cleaning of metals - non-metallic coating of metals (e.g., plasticising, enamelling, lacquering) - hardening, buffing of metals - boring, turning, milling, eroding, planing, lapping, broaching, levelling, sawing, grinding, sharpening, polishing, welding, splicing, etc. of metalwork pieces - cutting of and/or writing on metals by means of laser beams