Conversation tube hearing aid
Conversation tube hearing aid, also known as a speaking tube, with ivory earpiece and rubberised fabric covered tube, but bell detached, by F.C. Rein, London, 1800-1860
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, also known as a speaking tube, with ivory earpiece and rubberised fabric covered tube, but bell detached, by F.C. Rein, London, 1800-1860
Ivory bell from a conversation tube hearing aid, also known as a speaking tube, by F.C. Rein, London, 1800-1860