Adjustable Supporting Leg

FIG. 1 is a front, right and top perspective view of an adjustable supporting leg, showing my design.

FIG. 2 is a rear, left and bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof.

The dashed broken lines depict portions of the adjustable supporting leg that form no part of the claimed design.