US PATENT SUBCLASS 83 / 680
.~.~ Spiral type cutter

Current as of: June, 1999
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83 /   HD   CUTTING

651  DF  TOOL OR TOOL WITH SUPPORT {12}
679  DF  .~ Cutting couple type {9}
680.~.~ Spiral type cutter

DEFINITION

Classification: 83/680

(under subclass 679) Device constructed to make a cut in the shape of a series of convolutions of ever increasing radius.