| 摘要 |
A data storing medium comprising a substrate, a first display portion, provided on the substrate, for displaying predetermined data, the first display portion having a first recording material storing data by first recording energy, and erasing stored data of history of the use by predetermined erasing energy, and a second display portion, provided on the substrate, for displaying the same data as displayed by the first display portion, the second display portion having a second recording material for storing the data by a second recording energy different from the first recording energy, and stored data being impossible to be erased.
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