| 165 / | HD | HEAT EXCHANGE |
| DIG 454 | DD | HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16} |
| DIG 471 | DD | .~ Plural parallel conduits joined by manifold {15} |
| DIG 486 | DD | .~.~ Corrugated fins disposed between adjacent conduits {1} |
| DIG 487 | | .~.~.~ Louvered |