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发明名称
Dispositif électrique de surveillance et de contrôle pour poste téléphonique
摘要
申请公布号
FR835182(A)
申请公布日期
1938.12.14
申请号
FRD835182
申请日期
1937.08.28
申请人
LE TAXIPHONE
发明人
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
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