Comrade Cao Qingzhong presided over the development of export-type AAA electronic ballasts in 1994, and the export revenue in 1995 was more than 4 million yuan; in 1996, he presided over the development of XX series electronic ballasts and high-efficiency electronic energy-saving lamps. In 1997, he presided over the development of the automatic control system of the UDS-T diamond press, and creatively proposed the structure of the control system. In 2000, the comrade served as the executive deputy director of the company's technology center. He chaired the research and development of the UDS-II diamond press as the person in charge of the project technology, and designed and manufactured a "fool" and intelligent press. The field of diamond manufacturing has reached the world's advanced level, and it has laid a solid foundation for the highest domestic specifications, the largest scale, and the most advanced technology.