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发明名称
Perfectionnements apportés aux récepteurs téléphoniques
摘要
申请公布号
FR697265(A)
申请公布日期
1931.01.15
申请号
FRD697265
申请日期
1930.06.12
申请人
FELTEN & GUILLEAUME CARLSWERK ACTIEN-GESELLSCHAFT
发明人
分类号
H04R3/00
主分类号
H04R3/00
代理机构
代理人
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地址
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