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Unitary amplifier for hearing aids
US 2,564,425 A
Filed
: 07/08/1948
Issued
: 08/14/1951
Est. Priority Date
: 07/08/1948
Status: Expired due to Term
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Petitions
5
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Current Assignee
Frank S. Corso
,
Theodore H. Crabtree
Original Assignee
Frank S. Corso
,
Theodore H. Crabtree
Inventors
Corso, Frank S.
,
Crabtree, Theodore H.
Application Number
US03/037,584
Time in Patent Office
1,132 Days
Field of Search
US Class Current
381/319
CPC Class Codes
H04R 25/04
comprising pocket amplifiers
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