Legal declaration of Ji Nan Heng Ruijin Test

 20KN, 30KN, 50KN, 100KN Ring stiffness and R

 JG 225-2007 Metal Corrugated Pipe Used in Pr

 WDW-100J, 120J, 100KN, 120KN testing machine

 Standards: GB/T 5223.3-2005 ste

 HRJ-Test machine   GB / T5349 - 2005