US PATENT SUBCLASS 165 / DIG 461
.~ Plate fins formed with tubular projections which join with projections of adjacent plates to form parallel conduits


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165 /   HD   HEAT EXCHANGE

DIG 454  DD  HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16}
DIG 461.~ Plate fins formed with tubular projections which join with projections of adjacent plates to form parallel conduits {1}
DIG 462  DD  .~.~> Tapering, nested projections {1}