US PATENT SUBCLASS 165 / DIG 331
.~ Air draft passage confined entirely by heat transfer surface


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165 /   HD   HEAT EXCHANGE

DIG 327  DD  THERMOSYPHONIC HAVING VERTICAL AIR DRAFT PASSAGE {3}
DIG 331.~ Air draft passage confined entirely by heat transfer surface {2}
DIG 332  DD  .~.~> Coaxial ducts define air draft passage and annular passage for heat exchange fluid {1}
DIG 335  DD  .~.~> Plural air draft passages enclosed by casing {1}