Our factory was established in 1998, and it was located in the No.3 Haimen Road, Hebei District, Tienjin China. The Manager of the factory is Mr. Liu Zhensheng. And he was graduated from the vacuum tube technology of TsinghuaUniversity, he had worked at the development research and management as well as manufacture of the vacuum tube for many years in the Peking vacuum tube factory , and accumulated the rich experiences in this area.