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发明名称
Schaltungsanordnung zur Pfeifminderung bei Lautfernsprechanlagen
摘要
申请公布号
DE1058563(B)
申请公布日期
1959.06.04
申请号
DE1956S047606
申请日期
1956.02.22
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
MARTIN DIPL.-ING. ERWIN
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
地址
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