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