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发明名称
Improvements in or relating to radio signalling systems
摘要
申请公布号
GB352590(A)
申请公布日期
1931.07.16
申请号
GB19300012846
申请日期
1930.04.25
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H03G3/20;H04B7/005;H04L27/10
主分类号
H03G3/20
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代理人
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