Conversation tube hearing aid
1801-1900
Medresco Portable Hearing Aid
1953
Ear trumpet made from an animal horn
1701-1900
Alta2 Invisible In the Canal hearing aid
2018
Intra aural hearing aid
1978-1981
Conversation tube hearing aid
1860-1900
Gutta-percha ear trumpet hearing aid, 1840-1910
1840-1910
Ear trumpet and walking stick combined
1875-1885
Conversation tube hearing aid
1870-1920
Hearing aid, type BE14
1978-1980
Ear trumpet hearing aid
1869-1900
Ear trumpet
1850-1900
Alta2 Invisible In the Canal hearing aid
2018
Brass ear trumpet
1801-1900
Mallock-Armstrong ear defenders, London, England, 1914-1918
1914-1918
Ear trumpet made from an animal horn
before 1935
Swan-shaped ear trumpet
1801-1900
Swan shaped ear trumpet
1850-1900
Silver ear trumpet hearing aid
1829
Telescope ear trumpet
1850-1900
Acoustic impedance meter type ZA20
1970-1980
Telescopic ear trumpet
1840-1900
Double ear trumpet with headband
1850-1928
Telescoping ear trumpet
1870-1900
Infant audiometer, Denmark, 1970-1980
1970-1980
Struycken monochord (cased) made by H. Pfau of Berlin circa 1930
1930
Soft toy, with cochlear implant, China, 1999
1999
Phonic Ear and F.M. charger used in speech training
1960-1970
Small crescent-shaped metal ear trumpet
1850-1930
Hearing aid
1850-1910
Conversation tube hearing aid
1801-1900
Tin plate ear trumpet
1850-1900
Part of a hearing aid
1801-1900
Ear trumpet hearing aid
1801-1900
Conversation tube hearing aid, Europe, 1850-1920
1850-1920
Hearing aid, Sonotone 1000
1960-1970
Telescopic ear trumpet hearing aid
1900-1950
Ear trumpet hearing aid
1801-1900
Hearing aid
1801-1900
Conversation tube hearing aid
1840-1900
Conversation tube hearing aid
1840-1900
Small ear trumpet
Brass ear trumpet, English(?), 19th century
1801-1900
Ear trumpet
1801-1900
Anatomical model of the ear
1960-1968
Conversation tube hearing aid
1900-1950
Portable microscope requiring a fibreoptic light source
1960-1975
Miniature ear trumpets
1805-1900
Acoustic headband with pair of auricle hearing aids
1900-1930
Ear trumpet made from shell
1850-1900