| 摘要 |
A temperature-sensitive switch in a refrigerator or freezer, separate from the refrigeration and freezer equipment, remains open when the temperature is below a predetermined level and closes when the temperature rises above the predetermined level. A visible alarm and an audible alarm are provided outside the refrigerator and freezer at a commercial power source wall-type outlet. A battery is electrically connected to the visible and audible alarms via the temperature-sensitive switch whereby when the temperature in the refrigerator or freezer rises above the predetermined level, the alarms are actuated.
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