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发明名称
Mikrophone und Lautsprecher mit Richtcharakteristik
摘要
申请公布号
DE754291(C)
申请公布日期
1952.10.20
申请号
DE1935E047055D
申请日期
1935.06.09
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04R1/34
主分类号
H04R1/34
代理机构
代理人
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地址
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