(under subclass 691.1) Subject matter where multiple discrete stages or levels of a condition are monitored, and a different discrete humanly perceptible signal is provided for each stage or level.
(1) Note. For example, a "pre-alarm" warning vs. an all-out alarm.
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328+, for a generic audible signaling system with degree or urgency.
691.4, for a condition responsive with plural indicating signals.