US PATENT SUBCLASS 172 / 212
.~ Interrelated tool shift and ground support manipulation

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

204  DF  ALTERNATING FOR RIGHT OR LEFT HAND OPERATION (OTHER THAN SCRAPER) {10}
212.~ Interrelated tool shift and ground support manipulation

DEFINITION

Classification: 172/212

(under subclass 204) Apparatus having a wheel or wheel substitute which automatically assumes a new supporting position with respect to its former supporting position, and also with respect to the earth working means, in response to adjustment of the earth working means to alternate positions.