A support structure is provided for the bending roller to facilitate {TAIL ~ a movement} thereof to effect not only a cylindrical bending of the strip material but also, and upon {HEAD ~ a swivelling} of the bending roller, a cylindrical as well as an increasing diameter spiral can be formed 
A support structure is provided for the bending roller to facilitate { TAIL ~ a movement } thereof to effect not only a cylindrical bending of the strip material but also , and upon { HEAD ~ a swivelling } of the bending roller , a cylindrical as well as an increasing diameter spiral can be formed
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