… metal by bending, folding, straightening, flattening, shearing, punching, notching or nibbling (excluding … draw-benches); presses for working metal or metal carbides, not specified above. …
Explanatory notes
… form of metal or metal carbides. In general machine-tools are power-driven but similar machines, worked by hand or … a set of three or more rolls, until the desired path (arc, circle, oval) of the longitudinal axis of the sheet or … in the structure of the metal occurs not over the entire area of the metal, but in places of deformation only as a …