Ping Zhang

Sichuan Kezhi Civil Defense Equipment Co., Ltd. engages in the research, development, production, sale, and installation of protective equipment, chemical protection equipment, and other special equipment for human defense. Its products include reinforced concrete protection equipment, steel structure protection equipment, valves, anti-electromagnetic pulse equipment & facilities, subway & tunnel mainline protection doors, toxic filter ventilation equipment, nuclear & chemical alarms, and monitoring & control equipment. The company was founded on February 11, 2009 and is headquartered in Chengdu, China.

Shenzhen Towardwell Electric Power Science & Tech Co., Ltd. is a private company that manufactures and sells distribution network automation equipment. The company is based in Shenzhen, China. The Chinese company was founded in 2004. The CEO is Yue Hui Wu.

Guangzhou Knowledge Circle Network Technology Co., Ltd. is the private company behind the fun exercise (knowledge circle brand), which provides a professional online education counseling exercise punching tool. The company is based in Guangzhou, China. The tool helps teachers and institutions complete business scenarios such as admissions promotion, online lessons, counseling reviews, assignment correction, answer evaluation, etc. The Chinese company has more than 60,000 teachers and 10 million students. The company was founded in 2017, and the CEO is Da Wei Sun.