US PATENT SUBCLASS 172 / 222
.~.~.~ With translational movement of axes

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}
219  DF  .~ Tool shifted for opposite throw {3}
221  DF  .~.~ Plural tools shifted about individual vertical axes {1}
222.~.~.~ With translational movement of axes

DEFINITION

Classification: 172/222

(under subclass 221) Apparatus wherein, in addition to the movement of the earth working elements about their vertical axes, at least one of the axes is also moved horizontally at the same time.