| 165 / | HD | HEAT EXCHANGE |
| DIG 9 | DD | HAVING A SOLID HEAT STORAGE MASS FOR ABSORBING HEAT FROM ONE FLUID AND RELEASING IT TO ANOTHER (I.E. REGENERATOR) {5} |
| DIG 13 | DD | .~ Movable heat storage mass with enclosure {3} |
| DIG 16 | DD | .~.~ Rotary storage mass {6} |
| DIG 20 | DD | .~.~.~ Seal and seal-engaging surface are relatively movable {3} |
| DIG 21 | | .~.~.~.~ Seal engaging a face of cylindrical heat storage mass {2} |
| DIG 22 | DD | .~.~.~.~.~> Seal defining sector-shaped flow area |
| DIG 23 | DD | .~.~.~.~.~> Brush-type seal |