Perpetual perfected calendar, of the type constituted by two superimposed pieces and united by their center in rotating organization, characterized essentially because the main disk contains printed the days of the shortest month of the year, which is february, starting the numbering on the right, in the that the number one appears alone, and following the numbering in four rows of seven numbers each, with the exception of the last row, which is six numbers, with the remaining square or grid being emptied as a window, as well as the squares initials of the following row which allow to see blank areas of the backup disk. (Machine-translation by Google Translate, not legally binding)
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