The Ardente Hearing aid, London, England, 1920-1930
1920-1930
Hearing aid
1900-1940
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
Silver ear trumpet hearing aid, London, England, 1814
1814
Intra aural hearing aid
1978-1981
Brass ear trumpet
1801-1900
Conversation tube hearing aid
1860-1900
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
Gutta-percha ear trumpet hearing aid, 1840-1910
1840-1910
Ear trumpet made from an animal horn
before 1935
Miniature ear trumpets
1805-1900
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
Portable microscope requiring a fibreoptic light source
1960-1975
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
Conversation tube hearing aid
1900-1950
Portable speech training aid
1965-1975
Ear trumpet
1850-1900
Set of eight tuning forks, Unknown maker, 1935-1950
1935-1950
Aluminium ear trumpet
1870-1917
Bakelite Ear Trumpet
1901-1940
Tortoiseshell Ear Trumpet Hearing Aid
1801-1900