... between Zhengzhou and Luoyang, great convience of transportation depend on the Longhai Railway, 310 National Highway, . Great Poet ... obtained national patent .[Characteristic]:With high pressure, good elasticity, displacement allowance, balance pipe error, absorb vibration, reduce noise, ... 162522155002025516252215600242601625221570028320162on high building , bracket support or fixed equipment for pipes , or ...