Plural spaced cutting edges adapted to pierce the container during a single operating stroke

Full Title

Hand- or power-operated devices for opening closed containers > Cutting devices, i.e. devices including at least one cutting element having one or more cutting edges for piercing through the wall of a closed container, e.g. can openers > punch type, i.e. the cutting element including at least one sharp cutting edge adapted to pierce through the container wall in, ordinarily, a single operating stroke > Plural spaced cutting edges adapted to pierce the container during a single operating stroke