US PATENT SUBCLASS 202 / 115
.~.~.~.~.~ Annularly arranged

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

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
96  DF  .~.~ Thermolytic {5}
105  DF  .~.~.~ Retort {14}
113  DF  .~.~.~.~ Plural {3}
115.~.~.~.~.~ Annularly arranged

DEFINITION

Classification: 202/115

The retorts are arranged in a closed chain which is not necessarily circular.