... .Patent number: 200920093169.0Applied rangeTo process various plate, shell and short axis type parts, such as VTD-200 Type is ... , precise instrument, electron, wrist watch, compressor, oil pump & glib, small size gear and motor-driven & pneumatic industry., etc.VTD-300, VTD ... -400 and VTD-500 is for gear, bear, brake disc, flywheel, wheel hub, flange plate, valve and pump industry., etc. Main ...