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经营范围
发明名称
Acoustic device
摘要
申请公布号
US2164157(A)
申请公布日期
1939.06.27
申请号
US19360090065
申请日期
1936.07.11
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
KENNEDY EDWARD P.
分类号
H04R9/08
主分类号
H04R9/08
代理机构
代理人
主权项
地址
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