Royal Service was established in Los Angeles, California.
Royal Service began production of the variable air volume system (VAV) in the United States.
Royal Service engages multiple industrial purification and medical air-conditioning projects.
Royal Service begin the design, integration and installation of air-conditioning and automatic control systems in American owned factories in China.
Royal Air Conditioning Design Engineering Company Limited is established in the province of Guangdong, China as a wholly-owned subsidiary of Royal Service.
The first high-rise skyscraper VAV project by Royal Service received a Luban Award for Construction Engineering, China's top construction award.
It was given the top prize by Science and Technology Committee of the China Installation Association.
Royal Service's VAV products are exported to Hong Kong and Macau in China.
Royal Service won the award for "High-tech Enterprise".
Royal Service celebrates their 40 year anniversary.
The Royal Service VAD automatic control system is introduced. It's equipped with network controls and real-time monitoring through a computer interface.