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The ornamental design for a checkbook calculator, as shown and described. |
FIG. 1 is a front, left, bottom perspective view of a checkbook calculator, showing my new design;
FIG. 2 is a front elevation view thereof shown in its open position;
FIG. 3 is a rear elevation view thereof shown in its open position;
FIG. 4 is a left side view thereof shown in its open position;
FIG. 5 is a right side view thereof shown in its open position;
FIG. 6 is a top view thereof shown in its open position; and,
FIG. 7 is a bottom view thereof shown in its open position.
FIGS. 2-7 are drawn on a reduced scale from FIG. 1.
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