US PATENT SUBCLASS 408 / 230
.~.~.~ Spiral channel

Current as of: June, 1999
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408 /   HD   CUTTING BY USE OF ROTATING AXIALLY MOVING TOOL

199  DF  TOOL OR TOOL WITH SUPPORT {12}
227  DF  .~ Having peripherally spaced cutting edges {3}
229  DF  .~.~ With axially extending relief channel {1}
230.~.~.~ Spiral channel

DEFINITION

Classification: 408/230

(under subclass 229) Device wherein the void area is of axial dimension and of circumferential dimension so that it extends helically along the tool-axis.