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The ornamental design for a perpetual calendar, as shown and described. |
FIG. 1 is a top perspective view of a perpetual calendar showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof the undisclosed rear being a mirror image;
FIG. 4 is an end elevational view thereof the undisclosed end being a mirror image;
FIG. 5 is a top perspective view of a second embodiment of FIG. 1;
FIG. 6 is a top plan view thereof;
FIG. 7 is a front elevational view thereof; and
FIG. 8 is a side elevational view thereof, the undisclosed side being a mirror image.
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