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发明名称
Carrier-current telegraph system
摘要
申请公布号
US1779492(A)
申请公布日期
1930.10.28
申请号
US19290345057
申请日期
1929.03.07
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
REA WILTON T.
分类号
G01R5/14;H04L5/06
主分类号
G01R5/14
代理机构
代理人
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地址
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