| 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 357 | DD | .~.~ Forming annular heat exchanger {1} |
| DIG 358 | | .~.~.~ Radially arranged plates |