Conversation tube hearing aid
1860-1900
Conversation tube hearing aid, probably English, 1870-1895
1870-1895
Long leather covered metal ear trumpet hearing aid
1880-1910
Conversation tube hearing aid
1851-1900
Conversation tube hearing aid, Europe, 1850-1920
1850-1920
Vulcanite conversation tube hearing aid
1860-1920
Conversation tube hearing aid
1840-1900
Swan-shaped ear trumpet
1801-1900
Hearing aid
1801-1900
Conversation tube hearing aid
1840-1900