US PATENT SUBCLASS 165 / DIG 363
.~.~ Slotted plates forming grid

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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 363.~.~ Slotted plates forming grid