Mounting device

FIG. 1 is a first perspective view of an ornamental design for a mounting device;

FIG. 2 is a second perspective view of the ornamental design;

FIG. 3 is a view of a front side of the ornamental design;

FIG. 4 is a view of a rear side of the ornamental design;

FIG. 5 is a view of a first side of the ornamental design;

FIG. 6 is a view of a second side of the ornamental design;

FIG. 7 is a view of a first end of the ornamental design; and,

FIG. 8 is a view of a second end of the ornamental design.

Broken lines in the illustrations of the drawing indicate unclaimed parts of the article that are not part of the design illustrated therein.