US PATENT SUBCLASS 165 / DIG 336
.~.~.~ Angled air draft passage


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

DIG 327  DD  THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE {3}
DIG 331  DD  .~ Air draft passage confined entirely by heat transfer surface {2}
DIG 335  DD  .~.~ Plural air draft passages enclosed by casing {1}
DIG 336.~.~.~ Angled air draft passage