US PATENT SUBCLASS 210 / 86
.~ Material level or thickness responsive

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

85  DF  WITH ALARM, INDICATOR, REGISTER, RECORDER, SIGNAL OR INSPECTION MEANS {7}
86.~ Material level or thickness responsive

DEFINITION

Classification: 210/86

(under subclass 85) Apparatus, responsive to a change in the level or thickness of a material being treated within the apparatus.