US PATENT SUBCLASS 202 / 252
.~.~.~ Bottom

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

81  DF  APPARATUS {4}
239  DF  .~ Elements {10}
242  DF  .~.~ Closures {5}
252.~.~.~ Bottom {1}
253  DF  .~.~.~.~> Cooling or quenching

DEFINITION

Classification: 202/252

Devices for closing the bottoms of retorts, kilns or stills.

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196, Mineral Oils: Apparatus,

130+,.