US PATENT SUBCLASS 165 / 131
.~ Flues formed by vertical corrugations of heat transmitter

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

128  DF  THERMOSYPHONIC FLUE TYPE {3}
131.~ Flues formed by vertical corrugations of heat transmitter

DEFINITION

Classification: 165/131

(under subclass 128) Apparatus in which vertically extending corrugations of a heat transmitting sheet secured to a heating or cooling conduit form flow producing flues.