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经营范围
发明名称
Perfectionnements aux installations d'enregistrement et de reproduction des sons
摘要
申请公布号
FR780265(A)
申请公布日期
1935.04.23
申请号
FRD780265
申请日期
1934.01.09
申请人
发明人
DURAND LOUIS, PAUL;RICCHIARDI PIER, CARLO
分类号
H03F1/00
主分类号
H03F1/00
代理机构
代理人
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地址
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