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The ornamental design for fuel cell, as shown and described. |
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FIG. 1 is a top plan view of a fuel cell;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevation thereof, the left side being a mirror image of that shown;
FIG. 6 is a perspective view of a fuel cell, showing my new design, the broken lines showing the fittings secured to my new design is for illustrative purposes only and forms no part of the claimed design.
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