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发明名称
Transmission measuring system
摘要
申请公布号
US2244041(A)
申请公布日期
1941.06.03
申请号
US19390296687
申请日期
1939.09.26
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
ANDREWS JOSEPH FRANK
分类号
H04M3/28
主分类号
H04M3/28
代理机构
代理人
主权项
地址
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