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发明名称
Hearing aid apparatus
摘要
申请公布号
US2575671(A)
申请公布日期
1951.11.20
申请号
US19500186184
申请日期
1950.09.22
申请人
MCCREARY HAROLD J
发明人
MCCREARY HAROLD J.
分类号
H04R25/00
主分类号
H04R25/00
代理机构
代理人
主权项
地址
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