Some observations concerning the value of the audiphone

Collection:: Medicine in the Americas, 1610-1920
Author(s):: Knapp, Herman, 1832-1911, author
Publication:: [New York?] : [publisher not identified], [1880?]
Language(s):: English
Format:: Text
Subject(s):: Hearing Aids
Copyright:: The National Library of Medicine believes this item to be in the public domain. (More information)
Extent:: 9 pages
Illustrations:: Illustrations
NLM Unique ID:: 101684573 (See catalog record)
Permanent Link:: http://resource.nlm.nih.gov/101684573

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