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Credit
Die Schallleitung durch die Kopfknochen und ihre Bedeutung für die Diagnostik der Ohrenkrankheiten : eine physiologisch-klinische Studie / von August Lucae. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.