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发明名称
Einrichtung zur Verhinderung des unerwuenschten Abhoerens von Telefongespraechen
摘要
申请公布号
DE905627(C)
申请公布日期
1954.03.04
申请号
DE1952T005593
申请日期
1952.01.15
申请人
TELEFONBAU UND NORMALZEIT G.M.B.H.
发明人
BERGSTRAESSER GEORG
分类号
H04M1/68;H04M17/02
主分类号
H04M1/68
代理机构
代理人
主权项
地址
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