US PATENT SUBCLASS 202 / *
.~.~ Autothermic

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

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*.~.~ Autothermic {5}
210  DF  .~.~.~> Heap
211  DF  .~.~.~> Kiln {3}
215  DF  .~.~.~> Directly heated chamber {1}
217  DF  .~.~.~> Retort {6}
227  DF  .~.~.~> Quencher {3}