US PATENT SUBCLASS 172 / 191
.~.~ Plural

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

133  DF  DIVERSE TOOLS {29}
190  DF  .~ Including vertical, longitudinally oriented disc or blade (e.g., as stabilizer) {1}
191.~.~ Plural

DEFINITION

Classification: 172/191

(under subclass 190) Apparatus comprising a plurality of separate planar longitudinal blades.