FIG. 1 is a perspective view of an ornamental design for a wall mounted extension arm according to a first embodiment of my invention;
FIG. 2 is another perspective view thereof, but showing the extended portion in a different location;
FIG. 3 is a right side view of FIG. 1, but shown in a folded position;
FIG. 4 is a right side view of FIG. 1, the left side being a mirror image thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a front view thereof;
FIG. 8 is a rear view thereof;
FIG. 9 is a right side view of a second embodiment of a wall mounted extension arm, the left side being a mirror image thereof;
FIG. 10 is a front view thereof;
FIG. 11 is a rear view thereof;
FIG. 12 is a bottom view thereof; and,
FIG. 13 is a top view thereof.