| 165 / | HD | HEAT EXCHANGE |
| DIG 135 | DD | MOVABLE HEAT EXCHANGER {4} |
| DIG 139 | DD | .~ Fully rotatable {5} |
| DIG 152 | DD | .~.~ Rotating agitator {2} |
| DIG 153 | | .~.~.~ Flow space or fluid chamber defined between two relatively movable, closely spaced coextensive surfaces |