Ruige Instruments of Surveying and Mapping

Zhikai Instruments and Apparatuses

Luoyang Beidou Instruments of Surveying and Mapping (Bo South Road No.30 Unit Shop)

Tianyu Surveying and Mapping (Middle Haida Luoyang General Agent)

Tianmei Experiment Instrument (Zhoucheng Mansion Branch)

Huayu Instruments of Surveying and Mapping