| 摘要 |
A perpetual monthly calendar includes a front panel with a month grid of cells capable of displaying an accurate number and configuration of cells for any month. This embodiment also includes an at least semi-transparent sheet in front of the front panel with a write-on/wipe-off surface.Another embodiment includes a front panel, a first surface with a first number matrix, and a second surface with a second number matrix. The front panel displays a grid of cells with columns representing weekdays and rows representing the upper rows of a calendar and at least one lower row of a calendar. A window is cut out of the front panel in each cell, so that when the first surface or second surface is moved horizontally, the front panel displays an accurate number and configuration of days for any month.
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