Coin and method for testing the coin
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United States of America Patent
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Feb 20, 2018
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app pub date -
Jul 26, 2013
filing date -
Jul 30, 2012
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Abstract
A coin comprises a core made of a first metal, an outer ring surrounding the core concentrically and made of a further metal, and a central ring between the core and outer ring fixedly connected thereto. The central ring consists of an electrically insulating material. Further, the central ring is transparent to electromagnetic waves of a first wavelength range and is less transparent or not transparent to a second wavelength range. Methods for testing the coin are also described.
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