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发明名称
Perfectionnements aux hauts-parleurs électrodynamiques
摘要
申请公布号
FR993439(A)
申请公布日期
1951.10.31
申请号
FRD993439
申请日期
1949.06.21
申请人
发明人
LYON PIERRE-EMILE
分类号
H04R9/04
主分类号
H04R9/04
代理机构
代理人
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