US PATENT SUBCLASS 451 / 180
.~.~.~ Internal

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}
180.~.~.~ Internal {1}
181  DF  .~.~.~.~> Abrading crank-pin

DEFINITION

Classification: 451/180

Internal:

(under subclass 178) Abrading machine in which the abrading is done by the radially inwardly facing peripheral face.

SEE OR SEARCH CLASS

144, Woodworking,

49+, for a miscellaneous single operation machine.

409, Gear Cutting, Milling, or Planing,

143, for a milling machine having means for internal milling.