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经营范围
发明名称
Perfectionnements apportés aux dispositifs de transformation électroacoustiques
摘要
申请公布号
FR780952(A)
申请公布日期
1935.05.07
申请号
FRD780952
申请日期
1934.11.08
申请人
发明人
WILLANS PETER WILLIAM
分类号
H04R9/08
主分类号
H04R9/08
代理机构
代理人
主权项
地址
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