US PATENT SUBCLASS 210 / 203
.~.~ Filters

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

198.1  DF  WITH MEANS TO ADD TREATING MATERIAL {5}
200  DF  .~ Plural distinct separators {2}
203.~.~ Filters {1}
204  DF  .~.~.~> Sectional chamber press type

DEFINITION

Classification: 210/203

(under subclass 200) Apparatus having two or more filtering units.