| 摘要 |
A data-indicating device having a multitude of data-carrying discs arranged in a casing wherein at least one of the discs has a transparent inner portion and an outer peripheral portion and the discs are arranged such that the data carried by the other discs shows through the transparent inner portion of the one and are viewable through apertures in the front cover of the casing. An embodiment as a perpetual calendar is disclosed.
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