Tianjin 712 Communication & Broadcasting. 

TianJin 712 Communication & Broadcasting Co., Ltd. is a Chinese enterprise specializing in the research, development, production, and sale of a wide array of communication equipment. Their product lines, distributed throughout China, encompass tactical radio systems, airborne communication units, and various railway communication devices. Notable offerings include wireless train dispatching solutions, systems for urban mass transit, and digital radio shunting systems tailored for aircraft, which integrate components such as locomotive controllers, master radios for shunting areas, and remote-control terminals. The company also provides general ground communication infrastructure. Serving clients primarily in defense and railway construction, along with other industries, TianJin 712 was established in 1936 and is headquartered in Tianjin, China. It operates as a subsidiary of Tianjin Zhonghuan Electronic and Information (Group) Co., Ltd.