| 165 / | HD | HEAT EXCHANGE |
| DIG 454 | DD | HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16} |
| DIG 464 | DD | .~ Conduits formed by joined pairs of matched plates {2} |
| DIG 465 | DD | .~.~ Manifold space formed in end portions of plates {1} |
| DIG 466 | | .~.~.~ Manifold spaces provided at one end only |