EXTERNAL ELEMENT WITH A PRESSURE SENSOR
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United States of America Patent
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Dec 8, 2015
filing date -
Dec 15, 2014
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Abstract
The present invention concerns an external timepiece element including a frame made of a first material, said external element further including at least one pressure or altitude sensor, characterized in that said pressure or altitude sensor is formed of at least one disc or plate, said disc or plate being formed of or coated with a binder and a piezochromic pigment, said piezochromic pigment being selected to react at a specific pressure, so that said pigment changes from a first colour to a second colour when said specific pressure is reached.
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