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发明名称
Communication system
摘要
申请公布号
US2131920(A)
申请公布日期
1938.10.04
申请号
US19370142093
申请日期
1937.05.12
申请人
发明人
分类号
H04L12/14
主分类号
H04L12/14
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代理人
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地址
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