US PATENT SUBCLASS 165 / DIG 450
.~.~.~ Including integral abutting or interlocking elements

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 355  DD  HAVING SEPARATE FLOW PASSAGE FOR TWO DISTINCT FLUIDS {7}
DIG 442  DD  .~ Conduits {5}
DIG 449  DD  .~.~ Vertically stacked conduits {1}
DIG 450.~.~.~ Including integral abutting or interlocking elements