Chinese coal mine machinery industry took to hydraulic support research and development from the late 1960s, and introduced dozens of sets of hydraulic supports from the United Kingdom, Germany, Poland and the former Soviet Union in the 70s; after the trial use, imitation and lessons learned, the development and application of hydraulic support gained rapid development in the 1980s, accompanied by successive development and production of over 20 different specifications of hydraulic supports embracing TD series, ZY series and ZZ series. Complete report is available @ http://goo.gl/8edY9q