US PATENT SUBCLASS 210 / 89
.~.~.~ With time control

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}
87  DF  .~ Responsive to fluid flow {1}
88  DF  .~.~ Meter-controlled cyclic systems {1}
89.~.~.~ With time control

DEFINITION

Classification: 210/89

(under subclass 88) Apparatus, including means operating during or after a predetermined interval of time.