US PATENT SUBCLASS 340 / 508
.~.~.~ Redundant (e.g., added circuit or loop)

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}
508.~.~.~ Redundant (e.g., added circuit or loop)

DEFINITION

Classification: 340/508

Redundant (e.g., added circuit or loop):

(under subclass 506) Subject matter having either duplicate primary alarm circuits, an added circuit, or double loops in the primary alarm circuit, to monitor at least an element of the primary circuit.