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发明名称
Hearing aids
摘要
申请公布号
US2794075(A)
申请公布日期
1957.05.28
申请号
US19530375288
申请日期
1953.08.19
申请人
MORGAN WILLIAM H
发明人
MORGAN WILLIAM H.
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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