We claim the ornamental design for “refrigerator,” as shown and described.
FIG. 1 is a left top front perspective view of a refrigerator or cooler and surface portion thereof in accordance with a first embodiment of our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof, the left side elevation being a mirror image thereof;
FIG. 5 is a top plan view thereof, the bottom plan view thereof being disclaimed;
FIG. 6 is a right front lower perspective view thereof;
FIG. 7 is a left top front perspective view of a refrigerator or cooler and surface portion thereof in accordance with a second embodiment of our new design;
FIG. 8 is a front elevation view thereof,
FIG. 9 is a rear elevation view thereof;
FIG. 10 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;
FIG. 11 is a top plan view thereof, the bottom plan view thereof be disclaimed; and,
FIG. 12 is a right front lower perspective view thereof.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.