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发明名称
Meespreek-en hoorinrichting voor vierdraadstelefoonverbindingen
摘要
申请公布号
BE603609(A2)
申请公布日期
1961.09.01
申请号
BE19610603609
申请日期
1961.05.10
申请人
DE STAAT DER NEDERLANDEN, TEN DEZE VERTEGENWOORDIGD DOOR DE DIRECTEUR-GENERAAL DER POSTERIJEN, TELEGRAFIE EN TELEFONIE
发明人
CORNELIS DE JONG
分类号
H04M3/56;(IPC1-7):H04M
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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