Title:
Electrically and acoustically excited hearing aid
Document Type and Number:
United States Patent 2363175
Inventors:
Grossman, Frederick M.
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Publication Date:
11/21/1944
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Referenced by:
Export Citation:
Assignee:
Grossman, Frederick M.
Primary Class:
Other Classes:
381/385, 181/132, 381/328, 381/313, 381/361, 381/373, 381/380
International Classes:
H04R25/00