USD601618S1 - Calculator

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FIG. 1 is a perspective view of a calculator, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view of the invention.

The broken lines depict environmental subject matter only and form no part of the claimed design.