Telescoping ear trumpet, 19th century
Pressed board ear trumpet, 19th century
Pressed board telescoping ear trumpet, 19th century
Tragus-like ear trumpet, 19th century
Burkhardt-Merian's tragus-like trumpet, 19th century
Elliptical opening trumpet, ca. 1875
Small Ear trumpet
Miniature ear trumpet, 19th century
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
