US PATENT SUBCLASS 202 / *
.~.~ Separatory and thermolytic

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

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*.~.~ Separatory and thermolytic {3}
207  DF  .~.~.~> Stump stills
208  DF  .~.~.~> Directly heated chamber
209  DF  .~.~.~> Still retort