2016JB/T 12829.2-2016 Four-roller plate bending machine part 2: technical conditions
1998JB/T 8778-1998 Technical conditions of 4-roll plate bending machine
JB/T 12829.2-2016 Four-roller plate bending machine part 2: technical conditions has been changed from JB/T 8778-1998 Technical conditions of 4-roll plate bending machine.