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发明名称
Telephone system
摘要
申请公布号
US2373908(A)
申请公布日期
1945.04.17
申请号
US19390278728
申请日期
1939.06.12
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
OSTLINE JOHN ELLIS
分类号
H04M15/38
主分类号
H04M15/38
代理机构
代理人
主权项
地址
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