| 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 373 | DD | .~.~ Adjacent heat exchange plates having joined bent edge flanges for forming flow channels therebetween {4} |
| DIG 383 | | .~.~.~ Interlocking flanges |