| 165 / | HD | HEAT EXCHANGE |
| DIG 454 | DD | HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16} |
| DIG 500 | DD | .~ Side-by-side conduits with fins {2} |
| DIG 501 | | .~.~ Plate fins penetrated by plural conduits {2} |
| DIG 502 | DD | .~.~.~> Lanced {1} |
| DIG 504 | DD | .~.~.~> Contoured fin surface |