| 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 42 | | .~ Particular structure of heat storage mass {1} |
| DIG 43 | DD | .~.~> Element for constructing regenerator rotor |