... leveler grooving roller machine Duct manufacture auto-line 4 ( duct machine )Advantages:Line consists of feeding metal frame, leveler grooving ... shear machine and folder machine. The electrical control is computer controlled. Notch and punch square machine, shear and folder ... forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing ...