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发明名称
Perfectionnements aux dispositifs acoustiques
摘要
申请公布号
FR716534(A)
申请公布日期
1931.12.22
申请号
FRD716534
申请日期
1931.05.05
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
E04B1/84;E04B1/99
主分类号
E04B1/84
代理机构
代理人
主权项
地址
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