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发明名称
Telephone switchboard
摘要
申请公布号
US2276515(A)
申请公布日期
1942.03.17
申请号
US19390311738
申请日期
1939.12.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ROBB THEODORE D.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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