US PATENT SUBCLASS 165 / DIG 459
.~ Strips with shaped, interfitted edges form heat exchanger core with plural passages


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165 /   HD   HEAT EXCHANGE

DIG 454  DD  HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16}
DIG 459.~ Strips with shaped, interfitted edges form heat exchanger core with plural passages {1}
DIG 460  DD  .~.~> With spacers interposed between adjacent passages