Gems & Jewelry
| Fri 25 Oct 2024
Beijing, Oct. 26 -- Beijing Polytechnic College has been granted a patent for jewelry grinding clamp. Ding Wenjun and Gao Piao developed the invention.
The patent application number is CN202321846729U 20230713. The patent publication number is CN220533907 (U). International Patent Classification codes are B24B37/27, B24B41/06..