| 165 / | HD | HEAT EXCHANGE |
| DIG 355 | DD | HAVING SEPARATE FLOW PASSAGE FOR TWO DISTINCT FLUIDS {7} |
| DIG 442 | | .~ Conduits {5} |
| DIG 443 | DD | .~.~> Adjacent conduits with transverse air passages (e.g., radiator core type, etc.) {3} |
| DIG 448 | DD | .~.~> Air conduits (e.g., radiator core type, etc.) |
| DIG 449 | DD | .~.~> Vertically stacked conduits {1} |
| DIG 451 | DD | .~.~> Including bent conduits |
| DIG 452 | DD | .~.~> Including fins |