Elastic membrane

FIG. 1 is a top perspective view of an elastic membrane showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front view thereof, a rear view being identical thereto;

FIG. 6 is a right-side view thereof, a left-side view being identical thereto;

FIG. 7 is a cross sectional view taken along section line 7 - 7 in FIG. 3 ; and,

FIG. 8 is an enlarged portion view taken along line 8 - 8 in FIG. 7 .

The broken lines in the drawings depict portions of the elastic membrane that form no part of the claimed design.