Audi-Ear, ca. 1925
Webster's Otophone, ca. 1860
Black silk funnel aid, 19th century
Small hand-held ear trumpet, 19th century
Small hand-held ear trumpet, 19th century
Small hand-held ear trumpet, 19th century
Otophone, ca. 1895
Small hand-held ear trumpet, 19th century
Small hand-held ear trumpet, ca. 1890
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Miniature ear trumpet, 19th century
Double parabolic ear trumpet, 19th century
Double parabolic ear trumpet, 19th century
Small ear trumpet, 19th century