US PATENT SUBCLASS 165 / DIG 493
.~.~ Welded or fused joint between conduit end and plate

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

DIG 454  DD  HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16}
DIG 492  DD  .~ Plural conduits with ends connected to tube plate {2}
DIG 493.~.~ Welded or fused joint between conduit end and plate