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Title:
Hearing intensifying and directing apparatus
United States Patent 3243525


Inventors:
Arthur, Eaton
Application Number:
US23679062A
Publication Date:
03/29/1966
Filing Date:
11/13/1962
Export Citation:
Click for automatic bibliography generation
Assignee:
Arthur, Eaton
Primary Class:
381/23.1
Other Classes:
181/125, 367/910, 381/342
International Classes:
H04S1/00
View Patent Images:
Download PDF 3243525  
US Patent References:
3124760N/A1964-03-10
2930858Binaural hearing-aid device1960-03-29
2166991Direction finding system1939-07-25
1973673Sound or air wave apparatus1934-09-11
1907723Sound reproducing device1933-05-09
Foreign References:
FR862452A1941-03-07
FR971273A1951-01-15




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