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发明名称
Perfectionnement aux combinés téléphoniques
摘要
申请公布号
FR1082770(A)
申请公布日期
1955.01.03
申请号
FRD1082770
申请日期
1953.05.22
申请人
发明人
DUCARPE PIERRE-GEORGE
分类号
H04R25/00
主分类号
H04R25/00
代理机构
代理人
主权项
地址
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