US PATENT SUBCLASS 209 / 251
.~.~ Reversible

Current as of: June, 1999
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209 /   HD   CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS

233  DF  SIFTING {16}
243  DF  .~ Feeding {5}
251.~.~ Reversible

DEFINITION

Classification: 209/251

(under subclass 243) Sifters adapted to sift material through in one direction and then to be reversed to sift the material in the opposite direction relatively to the sifting element or elements.