34 / | HD | DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS |
523 | DF | APPARATUS {40} |
108 | DF | .~ Rotary drums or receptacles {7} |
110 | DF | .~.~ External {6} |
113 | DF | .~.~.~ Plural {5} |
116 | DF | .~.~.~.~ With belts or felts {2} |
117 | .~.~.~.~.~ With threading, stripping, or guiding devices |