US PATENT SUBCLASS 451 / 220
.~.~.~.~.~.~ Long helix

Current as of: June, 1999
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451 /   HD   ABRADING

64  DF  MACHINE {12}
177  DF  .~ Rotary tool {3}
178  DF  .~.~ Rotary cylinder {11}
212  DF  .~.~.~ Reciprocating work holder {4}
213  DF  .~.~.~.~ Rectilinear {6}
218  DF  .~.~.~.~.~ Work rotating {4}
220.~.~.~.~.~.~ Long helix

DEFINITION

Classification: 451/220

Long helix:

(under subclass 218) Abrading machine which grinds a helical form on a workpiece.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222+, for abrading a comparatively short helix on a workpiece to form a thread therein.

SEE OR SEARCH CLASS

409, Gear Cutting, Milling, or Planing,

65+, for thread or helix generating.