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发明名称
Telephone substation apparatus
摘要
申请公布号
US2285022(A)
申请公布日期
1942.06.02
申请号
US19400321365
申请日期
1940.02.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
EDWARDS WILLIAM H.
分类号
H04M1/18
主分类号
H04M1/18
代理机构
代理人
主权项
地址
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