34 / | HD | DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS |
523 | DF | APPARATUS {40} |
201 | DF | .~ Houses, kilns, and containers {6} |
218 | DF | .~.~ With gas or vapor circulation for contact with treated material {8} |
219 | DF | .~.~.~ Recirculation of treating gas or vapor {5} |
222 | .~.~.~.~ Movable gas or vapor distributor |