Hearing aid

FIG. 1 is a front view of a first embodiment of a hearing aid with our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is another perspective view thereof;

FIG. 9 is a front view of a second embodiment of the hearing aid with our new design;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a top view thereof;

FIG. 14 is a bottom view thereof;

FIG. 15 is a perspective view thereof;

FIG. 16 is another perspective view thereof;

FIG. 17 is a front view of a third embodiment of the hearing aid with our new design;

FIG. 18 is a rear view thereof;

FIG. 19 is a left side view thereof;

FIG. 20 is a right side view thereof;

FIG. 21 is a top view thereof;

FIG. 22 is a bottom view thereof;

FIG. 23 is a perspective view thereof;

FIG. 24 is another perspective view thereof;

FIG. 25 is a front view of a fourth embodiment of the hearing aid with our new design;

FIG. 26 is a rear view thereof;

FIG. 27 is a left side view thereof;

FIG. 28 is a right side view thereof;

FIG. 29 is a top view thereof;

FIG. 30 is a bottom view thereof;

FIG. 31 is a perspective view thereof;

FIG. 32 is another perspective view thereof.

FIG. 33 is a front view thereof of a fifth embodiment of the hearing aid with our new design;

FIG. 34 is a rear view thereof;

FIG. 35 is a left side view thereof;

FIG. 36 is a right side view thereof;

FIG. 37 is a top view thereof;

FIG. 38 is a bottom view thereof;

FIG. 39 is a perspective view thereof; and,

FIG. 40 is another perspective view thereof.

The broken lines in the drawings illustrate portions of the hearing aid that form no part of the claimed design. The dash-dot broken lines define the bounds of the claimed design and form no part thereof.