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发明名称
Transmission-level-controlling device
摘要
申请公布号
US1777355(A)
申请公布日期
1930.10.07
申请号
US19260134309
申请日期
1926.09.08
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
FETTER CHARLES H.
分类号
H04B3/10
主分类号
H04B3/10
代理机构
代理人
主权项
地址
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