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发明名称
Perfectionnement aux récepteurs téléphoniques
摘要
申请公布号
FR1067282(A)
申请公布日期
1954.06.14
申请号
FRD1067282
申请日期
1952.11.28
申请人
LE TELEPHONE PRIVE NATIONAL
发明人
BEAU GEORGES
分类号
H04R1/04
主分类号
H04R1/04
代理机构
代理人
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