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发明名称
Amplifying hearing aid
摘要
申请公布号
US2327320(A)
申请公布日期
1943.08.17
申请号
US19410418857
申请日期
1941.11.12
申请人
SONOTONE CORPORATION
发明人
SHAPIRO HARRY B.
分类号
H04R25/04
主分类号
H04R25/04
代理机构
代理人
主权项
地址
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