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经营范围
发明名称
Perfectionnements aux procédés et appareils pour diriger le son
摘要
申请公布号
FR801656(A)
申请公布日期
1936.08.12
申请号
FRD801656
申请日期
1935.12.06
申请人
发明人
STEUART DOUGLAS, STUART SPENS;D NINA, BENITA, MARY DOUGLAS-HAMILTON,
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
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地址
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