US PATENT SUBCLASS 83 / 672
.~.~ Helical tool

Current as of: June, 1999
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83 /   HD   CUTTING

651  DF  TOOL OR TOOL WITH SUPPORT {12}
663  DF  .~ Rotatable type {11}
672.~.~ Helical tool

DEFINITION

Classification: 83/672

(under subclass 663) Device wherein at least a portion of the work-contacting (cutting) part of the tool follows the mathematical space curve commonly known as a helix.