| 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 30 | DD | .~ Mass formed of modules arranged in three dimensional matrix ("Checkerwork") {4} |
| DIG 32 | | .~.~ Having gas supply or exhaust manifold structure {2} |
| DIG 33 | DD | .~.~.~> With flow control device (i.e. valve) |
| DIG 34 | DD | .~.~.~> With flow distributing baffle |