| 摘要 |
First and second head portions are movably urged toward a closed position, a fusible link holding the head portions in an open position. Electrical contacts are mounted on the head portions for making electrical contact when the head portions are in the closed position to energize an electric circuit for producing an alarm signal (e.g., turning on the lights in the room and ringing the doorbell of the building) when the head portions are in the closed position.
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