(under subclass 99) Spreader in which the opposite outward spreading of the running half-width increments is effected by contact with a respective one of a pair of helical configurations about the periphery of the roller, each winding oppositely outwardly from their common center.
SEE OR SEARCH CLASS
492, Roll or Roller,
35, for a roll, per se, having helically aligned surface projections, indentations or slits, not elsewhere provided for.
