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The ornamental design for a photo sensor, as shown and described.
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FIG. 1 is a rear perspective view of a photo sensor showing my new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a right side elevational view thereof, the left side elevational view being a mirror image thereof.
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