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发明名称
Perfectionnement aux appareils téléphoniques
摘要
申请公布号
FR1055603(A)
申请公布日期
1954.02.19
申请号
FRD1055603
申请日期
1952.05.09
申请人
发明人
HEILBRONNER PAUL
分类号
H04M1/21
主分类号
H04M1/21
代理机构
代理人
主权项
地址
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