US PATENT SUBCLASS 210 / 98
.~ Fluid current controlled cyclic system

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210 /   HD   LIQUID PURIFICATION OR SEPARATION

97  DF  FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE {14}
98.~ Fluid current controlled cyclic system

DEFINITION

Classification: 210/98

(under subclass 97) Apparatus in which an operating cycle is controlled in response to the liquid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

88+, for a meter controlled cyclic system.