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Conversation tube hearing aid

1801-1900

Conversation tube hearing aid

1801-1900

Conversation tube hearing aid, probably English, 1801-1900

1750-1840

Conversation tube hearing aid, probably English, 1800-1840

1750-1840

Conversation tube hearing aid, probably English, 1750-1840

1750-1840
Conversation tube hearing aid, also known as a speaking tube, with ivory earpiece and bell and rubberised fabric covered tube, by F.C. Rein, London, 1800-1860

Conversation tube hearing aid

1800-1860