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发明名称
Perfectionnements apportés aux machines parlantes quant à l'accouplement d'appareils acoustiques, à la production et à la conduite du son, notamment en ce qui concerne les appareils phonographes, couplophone et bidiaphragme
摘要
申请公布号
FR711864(A)
申请公布日期
1931.09.19
申请号
FRD711864
申请日期
1930.12.23
申请人
发明人
GOMEZ ANTOINE;ENGEL MAURICE
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
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