55304 ⎘
Mechanical deformation without removing material, e.g. in combination with laminating; Shaping by bending, folding, twisting, straightening, flattening or rim-rolling; Shaping by bending, folding or rim-rolling combined with joining; Apparatus therefor; Bending or folding; Folding edges combined with joining; Reinforcing edges during the folding thereof; of tubes