concept

Ear trumpet, 19th century

Speaking or conversation tube

Hearing aid for constant use. Two light cornets of imitation tortoiseshell joined by metal spring forming a head-band. Introduction of this form of instrument attributed to Napoleon's surgeon D. J. Larrey (1776-1842).

Otology in the Bible and Talmud / by Fred Rosner.

Principles and practice of modern otology / by John F. Barnhill ... and Ernest deWolfe Wales ... with 305 original illustrations, many in colors.

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Otology

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Hearing aid for constant use. Two light cornets of imitation tortoiseshell joined by metal spring forming a head-band. Introduction of this form of instrument attributed to Napoleon's surgeon D. J. Larrey (1776-1842).

Otology in the Bible and Talmud / by Fred Rosner.

Ear trumpet, 19th century

Speaking or conversation tube

Principles and practice of modern otology / by John F. Barnhill ... and Ernest deWolfe Wales ... with 305 original illustrations, many in colors.