annunciator
(UK, railways) A buzzer in a signal box that sounds when a train activates a treadle positioned on the track, and thus provides a warning or announcement of a nearby train.
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(UK, railways) A buzzer in a signal box that sounds when a train activates a treadle positioned on the track, and thus provides a warning or announcement of a nearby train.
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A signalling device that shows which of several electrical circuits is active, especially such a device in a telephone switchboard.
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Anything that announces something.
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