US PATENT SUBCLASS 172 / 116
.~.~ Tool propels implement

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
114  DF  .~ Specific propelling means {2}
116.~.~ Tool propels implement

DEFINITION

Classification: 172/116

(under subclass 114) Apparatus in which (1) the sole means disclosed for traversing the apparatus over the ground is the driven earth working element and the apparatus is not disclosed as being guided by a walking attendant or (2) the driven earth working element aids in traversing the apparatus over the ground or is the sole means for traversing the apparatus over the ground and there is a significant

recitation in a claim indicating this fact.