"Jinding Trademark" is a registered trademark of a company specializing in high-grade Yixing Zisha Minghu in the early 2th century. The store is located in Yixing Changqiao, and the owner's name is Wu Hanwen, and the pen name is "Gang Tao". The owner used to make pots, then lettering, and then being the boss.

The potters employed by this company are mostly famous artists, such as Yu Guoliang, Feng Guilin, Jiang Anqing, Wang Xichen, etc. Long-term orders include Cheng Shouzhen, Wu Yungen, Wang Baogen, Pei Shimin, Chen Boting, Shao Yunru, Ren Ganting, etc., and Pan Yaliang and Lu Lanfang often engrave and paint for him.