guard relay

guard relay

[′gärd ¦rē‚lā]
(electricity)
Used in the linefinder circuit to make sure that only one linefinder can be connected to any line circuit when two or more line relays are operated simultaneously.
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At 6:22, a note was passed through a peephole in the door, and a guard relayed it to a prison official who read aloud: 'Warden Vasquez declares inmate Harris B-66883 dead.'"