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发明名称
MULTI-CHANNEL TELEGRAPH CABLE SYSTEM
摘要
申请公布号
CA298714(A)
申请公布日期
1930.03.25
申请号
CAD298714
申请日期
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
CRESCENT F. NELSON
分类号
主分类号
代理机构
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