A drill bit for reaming in drilling rigs
A self-cooling twist drill
A rust-removal device for alloy reamers
A new type of tapered-shank keyway milling cutter
A positioning and fixing device for a cutting machine
A high-efficiency reamer for alloy machine tools
A circulating cooling device for a vertical lathe.
A recycling device for damaged milling cutters
A grinding device for equal-handle drills
An insulated box for heating metals
Qualifications and Honors
Qualifications and Honors