The ornamental design for a refrigerator, as shown and described.
FIG. 1 is a front perspective view of a refrigerator showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of the encircled portion ‘8’ in FIG. 1; and,
FIG. 9 is an enlarged view of the encircled portion ‘9’ in FIG. 2.
The broken lines illustrating portions of the refrigerator form no part of the claimed design.
The dot-dash broken lines in the figures represent an unclaimed boundary line and form no part of the claimed design.
The dot-dot-dash broken lines encircling portions of the claimed design in FIGS. 1 and 2 and that are illustrated as enlargements in FIGS. 8 and 9 form no part of the claimed design.