| 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 473 | | .~.~ With clamping member at joint between header plate and header tank {2} |
| DIG 474 | DD | .~.~.~> With compressible seal at joint |
| DIG 475 | DD | .~.~.~> Header plate and tank of dissimilar materials |