| 165 / | HD | HEAT EXCHANGE |
| DIG 72 | DD | AGITATOR OR IMPELLER MOTOR OPERATED BY FIRST HEAT EXCHANGE FLUID {1} |
| DIG 73 | | .~ To agitate or move second heat exchange fluid {2} |
| DIG 74 | DD | .~.~> Agitator structure confines first heat exchange fluid |
| DIG 75 | DD | .~.~> Agitator structure confines second heat exchange fluid |