US PATENT SUBCLASS 137 / 214
.~.~.~ Combined high and low level responsive

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
206  DF  .~ Gas pressure storage over or displacement of liquid {5}
213  DF  .~.~ With liquid level responsive gas vent or whistle {1}
214.~.~.~ Combined high and low level responsive

DEFINITION

Classification: 137/214

(under subclass 213) Apparatus wherein the gas vent or whistle is opened in response to a high and low liquid level.

SEE OR SEARCH THIS CLASS, SUBCLASS:

391, for liquid level control of both inflow and outflow in a tank.