US PATENT SUBCLASS 30 / 420
.~.~ Roller drive means causes initial piercing

Current as of: June, 1999
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30 /   HD   CUTLERY

400  DF  CAN OPENER {15}
416  DF  .~ With driven roller to continuously engage bead and relatively rotate can and opener {5}
420.~.~ Roller drive means causes initial piercing {2}
421  DF  .~.~.~> Including prime mover
422  DF  .~.~.~> Cutter comprising rotatable disc

DEFINITION

Classification: 30/420

(under subclass 416) Device wherein force applied to rotate the wheel-like member causes the cutting element to initially pierce the wall of the container.