... polishing machine. This product has won the prize of many national patents, includes: Patent of practicality new type 012101210661.5, ... of invention 01105380.1 etc, via of testing report from National product quality & control bureau: NPQC No.3. 200150013, ... for machines, electronics, instruments, meters, aviation, ships, cars, national defence, chemicals, light industries, etc.11. Work as one of ...