Yan Zhang

China Security & Surveillance Technology, Inc. engages in the design, manufacture, sale and installation of electronic surveillance solutions, including related software. Its customers are mainly comprised of government, commercial, industrial and education entities. The company was founded on November 14, 2006 by Guoshen Tu on and is headquartered in Shenzhen, China.

Tongji Innovaton & Entrepreneurship Holding Ltd. engages in the function as a foundation or endowment. It specializes in technology development, consulting, services, transfer, contracting, training, intermediary, and shareholding of investment, asset management, civil engineering, chemical industry, biology, and computer technology; and economic information consulting. The company was founded on May 26, 1997 and is headquartered in Shanghai, China.

Shanghai Tongji Environment Engineering Technology Co., Ltd. engages in the investment, operation, and service integration in the field of comprehensive environmental management. Its products and services include sludge treatment, wastewater treatment, municipal sewage investment & operation, large-scale sewage emergency treatment systems, VOCs governance technology, and water treatment technology. The company was founded on May 20, 1986 and is headquartered in Shanghai, China.

Shenzhen Zhongheng Huizhi Investment Co. Ltd. is a company that provides investment and investment advisory services. The company is based in Shenzhen, China.

Shanghai Leadgo-tech Co., Ltd. engages in the research, development, design, production, sales, and service provision of vacuum auxiliary materials and resin-based composite products. Its products are used in industrial production and national defence research fields. The company was founded on April, 29, 1999 and is headquartered in Shanghai, China.

Shenzhen Kesong Technology Co., Ltd. engages in the induction smart access control system industry. It provides access and elevator control; parking lot, access gate, attendance and visitors products. The company was founded in 1994 and is headquartered in Shenzhen, China.

Shanghai Tongji Engineering Consulting Co., Ltd. engages in engineering project management and engineering consulting services. It offers early investment decision consultation and evaluation, project management and agent construction, engineering cost consultation, bidding and procurement agency, engineering supervision, engineering technology consultation and management, third-party evaluation and post-evaluation, industry and business consultation, and environmental engineering and green building consultation. The company was founded on August 2, 1999 and is headquartered in Shanghai, China.

Shanghai Tonghao Engineering Management Co., Ltd. provides construction project management and consulting services. The company was founded on January 12, 2012 and is headquartered in Shanghai, China.