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发明名称
Anordning til Borteliminering af Maskinstøj ved kaskadekoblede Elektronrør.
摘要
申请公布号
DK45012(C)
申请公布日期
1931.12.21
申请号
DKD45012
申请日期
1930.07.22
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
分类号
主分类号
代理机构
代理人
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