1, Aviation Science and Technology: Stock code 688006,2019 was listed on the Shanghai Stock Exchange on July 22nd. The company's business scope covers lithium battery formation processing, testing equipment and charging and discharging equipment processing, and lithium battery pack protection plate product processing.

2. Wald: The stock code is 688028, which was listed on the Shanghai Stock Exchange on July 22, 2009. The company's business scope includes diamond tool production, diamond, building materials and Wujinjiaodian sales.

3. Baichu Electronics: Stock codes 688 188, 20 19 were listed on the Shanghai Stock Exchange on August 8; The company is mainly engaged in laser cutting;

4. Zhongwei Company: The stock code is 6880 12, which was listed on the Shanghai Stock Exchange on July 22nd, 20th19th. Is a micro-processing high-end equipment company.