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发明名称
Koblingsanordning ved Telefonanlæg med Topartslinier.
摘要
申请公布号
DK56190(C)
申请公布日期
1939.05.22
申请号
DKD56190
申请日期
1938.02.04
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
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主分类号
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