US PATENT SUBCLASS 340 / 507
.~.~.~ Fail-safe

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
501  DF  .~ With particular system function (e.g., temperature compensation, calibration) {8}
506  DF  .~.~ Alarm system supervision {7}
507.~.~.~ Fail-safe

DEFINITION

Classification: 340/507

Fail-safe:

(under subclass 506) Subject matter having the primary alarm circuit itself organized so as to give alarm upon its failure.