US PATENT SUBCLASS 73 / 307
.~.~.~ With warning signal or alarm

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

290 R  DF  LIQUID LEVEL OR DEPTH GAUGE {13}
305  DF  .~ Float {12}
306  DF  .~.~ Combined {1}
307.~.~.~ With warning signal or alarm {1}
308  DF  .~.~.~.~> Electric

DEFINITION

Classification: 73/307

(under subclass 306) Combinations of float gauges with signal or alarm means. The signal means is usually for the purpose of indicating extremes of high or low level.

SEE OR SEARCH CLASS

116, Signals and Indicators,

110, 111, 113, and 228+ for float-operated mechanical liquid level signaling means, per se.

122, Liquid Heaters and Vaporizers,

504.2, for boiler safety devices with alarms or indicators.

137, Fluid Handling, 558, for fluid handling apparatus including a liquid level responsive signal or indicator.