US PATENT SUBCLASS 137 / 554
.~.~ Electrical

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

551  DF  WITH INDICATOR, REGISTER, RECORDER, ALARM OR INSPECTION MEANS {6}
553  DF  .~ Position or extent of motion indicator {3}
554.~.~ Electrical

DEFINITION

Classification: 137/554

(under subclass 553) Apparatus in which electrical signal system means are used to sense and/or indicate the position or extent of motion in valves.

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392, for electrical characteristic sensing in level responsive or maintaining systems.

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340, Communications: Electrical,

870.01+, for quantitative electric telemetering systems of general application.