... feeding metal frame, leveler grooving roll DUCT MANUFACTURE AUTO-LINE 5 ( duct machine )Line combines a feeding metal frame, leveler grooving roll, hydraulic ... flange forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing machine ... -21-57841819Tel:86-21-57842040Phone:86-13817091187 DUCT MANUFACTURE AUTO-LINE 5 ( duct machine )