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发明名称
Telephone system
摘要
申请公布号
US2419282(A)
申请公布日期
1947.04.22
申请号
US19440542505
申请日期
1944.06.28
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
OSTLINE JOHN E.
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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