| 165 / | HD | HEAT EXCHANGE |
| DIG 454 | DD | HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16} |
| DIG 492 | | .~ Plural conduits with ends connected to tube plate {2} |
| DIG 493 | DD | .~.~> Welded or fused joint between conduit end and plate |
| DIG 494 | DD | .~.~> Conduit end deformed (e.g., expanded) to affix to plate |