| 摘要 |
In an automobile which uses a pneumatic tire, a puncture alarm device for one or more tires wherein a switching unit comprising conductive films formed on both the surfaces of an insulating material is disposed at the outer periphery of an air receiving portion of the tire, and when a metal piece or metal pile, such as a nail, sticks into the tire it penetrates through the switching unit and short-circuits the conductive films on both the surfaces thereof so that an alarm is issued.
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