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By certification 
main purposes: mainly used in mine tunnel, mine tunnel secondary purpose of support, as well as the support of the mountains tunnel support.
main features: pressure, supporting a long time, easy to install is not easy deformation characteristics.
it is mainly used for mining tunnel support ,with the features of high presure steel structure.
main features: pressure, supporting a long time, easy to install is not easy deformation characteristics.
it is mainly used for mining tunnel support ,with the features of high presure steel structure.
