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发明名称
Perfectionnements aux dispositifs acoustiques
摘要
申请公布号
FR716994(A)
申请公布日期
1931.12.30
申请号
FRD716994
申请日期
1931.05.13
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04R9/02;H04R9/06
主分类号
H04R9/02
代理机构
代理人
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