US PATENT SUBCLASS 172 / 381
.~.~ Non-planar earth working portion

Current as of: June, 1999
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172 /   HD   EARTH WORKING

329  DF  GUIDED BY WALKING ATTENDANT; SUPPORTED, PROPELLED, OR HELD IN POSITION BY ATTENDANT {7}
371  DF  .~ Hand tool {6}
381.~.~ Non-planar earth working portion

DEFINITION

Classification: 172/381

(under subclass 371) Apparatus wherein the earth working means has portions lying in more than one plane.