US PATENT SUBCLASS 210 / 120
.~ Vent control

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

97  DF  FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE {14}
120.~ Vent control

DEFINITION

Classification: 210/120

(under subclass 97) Apparatus comprising means controlling an opening above a liquid level for entrance or exit of a gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:

130+, for a liquid bypass which may also serve as a vent.

472, for a filter means with vent means.