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Binaural apparatus for teaching languages
US 2,777,901 A
Filed
: 11/07/1951
Issued
: 01/15/1957
Est. Priority Date
: 11/07/1951
Status: Expired due to Term
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Current Assignee
Leon E. Dostert
Original Assignee
Leon E. Dostert
Inventors
Dostert, Leon E.
Application Number
US03/255,211
Time in Patent Office
1,896 Days
Field of Search
US Class Current
434/157
CPC Class Codes
G09B 5/04
with audible presentation o...
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