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发明名称
Telephone system
摘要
申请公布号
US2360749(A)
申请公布日期
1944.10.17
申请号
US19430483985
申请日期
1943.04.22
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
WIEGAND FRANK H.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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