US PATENT SUBCLASS 83 / 621
.~.~.~.~ Concentrically mounted

Current as of: June, 1999
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83 /   HD   CUTTING

523  DF  MEANS TO DRIVE OR TO GUIDE TOOL {35}
613  DF  .~ With simple rectilinear reciprocating motion only {13}
618  DF  .~.~ Plural tools with same drive means {2}
620  DF  .~.~.~ Plural distinct cutting edges on same support {2}
621.~.~.~.~ Concentrically mounted

DEFINITION

Classification: 83/621

(under subclass 620) Apparatus wherein the plural tools are telescopically arranged one within another (e.g., nut and washer cutting and punching machines).