US PATENT SUBCLASS 202 / 220
.~.~.~.~ Flued

Current as of: June, 1999
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202 /   HD   DISTILLATION: APPARATUS

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*  DD  .~.~ Autothermic {5}
217  DF  .~.~.~ Retort {6}
220.~.~.~.~ Flued

DEFINITION

Classification: 202/220

The retort is constructed with flues or pipes either internal to it or a part of its wall.