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发明名称
DISPOSITIF D'EXTENSION DE LA PORTEE D'UNE LIGNE PAR L'EMPLOI D'UNE BATTERIE D'APPOINT
摘要
申请公布号
FR2339303(A1)
申请公布日期
1977.08.19
申请号
FR19770001821
申请日期
1977.01.21
申请人
WESTERN ELECTRIC CY INC
发明人
分类号
H04Q3/42;H04M19/00;(IPC1-7):H04M19/00
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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