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The ornamental design for a bridge calculator, as shown and described.
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FIG. 1 is a perspective view of a bridge calculator having a shape in accordance with my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is right side elevational view thereof; and,
FIG. 6 is a bottom plan view thereof.
The structure depicted by means of broken lines is for illustrative purposes only and forms no part of the claimed design.
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