| 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 387 | DD | .~.~ Including side-edge seal or edge spacer bar {5} |
| DIG 388 | | .~.~.~ Including spacer bar transverse to plate stack |