| 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 364 | DD | .~.~ With fluid traversing passages formed through the plate {4} |
| DIG 371 | | .~.~.~ Including mating flanges around fluid traversing passage |