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发明名称
Concentric conducting system
摘要
申请公布号
US1835031(A)
申请公布日期
1931.12.08
申请号
US19290365526
申请日期
1929.05.23
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
ESPENSCHIED LLOYD;AFFEL HERMAN A.
分类号
H01B11/18;H04B3/00;H04J1/00;H04M7/16
主分类号
H01B11/18
代理机构
代理人
主权项
地址
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