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发明名称
Signalanordning, navnlig til Opsogning af Personer i store Lokaler, Forretninger eller lignende.
摘要
申请公布号
DK43348(C)
申请公布日期
1930.11.10
申请号
DKD43348
申请日期
1929.08.10
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
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主分类号
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