We claim 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 in FIG. 1;
FIG. 9 is an enlarged view of the encircled portion in FIG. 2; and,
FIG. 10 is a front perspective view of the refrigerator shown in a state of use.
The evenly broken line in the figures depicts unclaimed portions of the refrigerator; the dash-dot-dot broken lines disclose the unclaimed boundaries of the isolated views; the broken lines form no part of the claimed design.
The dot-dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.