34 / | HD | DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS |
523 | DF | APPARATUS {40} |
192 | DF | .~ Removable shelf or tray type {4} |
195 | DF | .~.~ With gas or vapor circulation for contact with treated material {3} |
197 | .~.~.~ With heater {1} | |
198 | DF | .~.~.~.~> With liquid heater or vaporizer |