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发明名称
Improvements in or relating to electric signal transmission systems
摘要
申请公布号
GB471867(A)
申请公布日期
1937.09.10
申请号
GB19360007276
申请日期
1936.03.10
申请人
JOHN COLLARD
发明人
分类号
H04B3/28
主分类号
H04B3/28
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代理人
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