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经营范围
发明名称
Balancing duplex circuit
摘要
申请公布号
US2186006(A)
申请公布日期
1940.01.09
申请号
US19350042500
申请日期
1935.09.27
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
BUCKINGHAM WILLIAM D.
分类号
H04B1/58
主分类号
H04B1/58
代理机构
代理人
主权项
地址
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