| 165 / | HD | HEAT EXCHANGE |
| DIG 355 | DD | HAVING SEPARATE FLOW PASSAGE FOR TWO DISTINCT FLUIDS {7} |
| DIG 356 | DD | .~ Plural plates forming a stack providing flow passages therein {11} |
| DIG 393 | | .~.~ Including additional element between heat exchange plates {1} |
| DIG 394 | DD | .~.~.~> Corrugated heat exchange plate |