A new type of signaling device for mine hoists is introduced here.

介绍了一种新型的矿井提升机信号装置。

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A visual or audible signaling device, operated by relays, which indicates conditions of associated circuits.

用继电器操作的一种可视信号或音响信号装置，用以指示有关电路的情况。

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An event handler is a procedure, but the event itself is a signaling device, which must be raised and handled.

事件处理常式是一个程序，但是事件本身则是必须引发和处理的信号装置。

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But it has mystique, and it has great value as a signaling device.

FORBES: The Harder They Come

During Sunday's game, the relay device triggered, signaling a switch to open when it shouldn't have, causing the partial outage.

WSJ: Super Bowl Outage Traced to Faulty Entergy Gear