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The ornamental design for an acoustical horn for a behind-the-ear hearing aid, as shown. |
FIG. 1 is a perspective view of an acoustical horn for a behind-the-ear hearing aid showing my new design;
FIG. 2 is a left side view of the acoustical horn;
FIG. 3 is a right side view of the acoustical horn;
FIG. 4 is a top view of the acoustical horn;
FIG. 5 is a front view of the acoustical horn;
FIG. 6 is a rear view of the horn; and,
FIG. 7 is a bottom view thereof.
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