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Institution
University of Michigan. Libraries
3
Detroit Historical Society
2
Michigan State University. Libraries
2
Collection
Ann Arbor, Michigan: University of Michigan Library
3
G. Robert Vincent Voice Library Collection
2
Medical/Dental/Pharmaceutical
1
New York,: D. Appleton and company,
1
New York,: Harper & brothers,
1
New York,: J. S. Voorhies,
1
Language
eng
3
English
2
Type
text
4
sound recording-nonmusical
2
Place
United States
2
Topic
Inventions
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7
Inventors
3
Artificial Ear Drum Company
2
Blowena
2
Hearing Aids
2
Quackery
2
Science students
2
Borden, William, -- of New York city.
1
Patent laws and legislation -- United States.
1
Sickels, William B.
1
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