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发明名称
Perfectionnements aux dispositifs destinés à l'enregistrement et à la re production du son
摘要
申请公布号
FR718036(A)
申请公布日期
1932.01.18
申请号
FRD718036
申请日期
1931.06.02
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04R9/12
主分类号
H04R9/12
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代理人
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