| 165 / | HD | HEAT EXCHANGE |
| DIG 135 | DD | MOVABLE HEAT EXCHANGER {4} |
| DIG 139 | DD | .~ Fully rotatable {5} |
| DIG 152 | DD | .~.~ Rotating agitator {2} |
| DIG 154 | DD | .~.~.~ Hollow tubing rotates in vessel to stir contents {1} |
| DIG 155 | | .~.~.~.~ Tubing has radially or axially extending sections |