US PATENT SUBCLASS 209 / *
.~.~.~ Permeable

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

422  DF  STRATIFIERS {6}
*  DD  .~ With pneumatic treatment {3}
*  DD  .~.~ Movable bed {4}
*.~.~.~ Permeable {2}
466  DF  .~.~.~.~> Constant current {1}
468  DF  .~.~.~.~> Pulsating current {1}