Title: Apparatus for sensing air-pressure drop in a tire

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Abstract: An apparatus for sensing air-pressure drop in an automobile tire which comprises an air chamber having an internal air pressure maintained substantially equal to that of a tire under normal conditions and a sensor displaceable in accordance with differences in pressure between the air chamber and the tire. The apparatus is mounted in the inner end of the air valve of the tire, and when the air pressure in the tire drops to a certain level below an initial air pressure setting, the sensor is displaced. Sensor displacement is detected and an appropriate signal is provided to the driver.


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