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发明名称
Perfectionnements relatifs aux circuits d'instruments de téléphones
摘要
申请公布号
FR732067(A)
申请公布日期
1932.09.13
申请号
FRD732067
申请日期
1932.02.06
申请人
SIEMENS BROTHERS & CO. LTD
发明人
分类号
H04M1/58
主分类号
H04M1/58
代理机构
代理人
主权项
地址
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