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发明名称
Telephone system
摘要
申请公布号
US2345959(A)
申请公布日期
1944.04.04
申请号
US19430484681
申请日期
1943.04.27
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BLESSING LEONARD M.
分类号
H04M5/04
主分类号
H04M5/04
代理机构
代理人
主权项
地址
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