| 34 / | HD | DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS |
| 523 | DF | APPARATUS {40} |
| 201 | DF | .~ Houses, kilns, and containers {6} |
| 209 | DF | .~.~ Plural treating units or compartments {1} |
| 210 | DF | .~.~.~ With gas or vapor circulation for contact with treated material {5} |
| 217 | | .~.~.~.~ With conveyor and/or movable treated material support |