US PATENT SUBCLASS 408 / 221
.~.~.~ Including work-embracing cutting edges

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}
215  DF  .~ With pitch-stabilizing ridge {4}
219  DF  .~.~ Including tapered section {2}
221.~.~.~ Including work-embracing cutting edges

DEFINITION

Classification: 408/221

(under subclass 219) Device wherein said tool body portion comprises cutting crests which are formed in the surface of said tool body portions and are inwardly directed toward the tool-axis.

(1) Note. The device of this subclass is commonly called threading die.