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发明名称
Electric signaling system
摘要
申请公布号
US2267827(A)
申请公布日期
1941.12.30
申请号
US19390286500
申请日期
1939.07.26
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HUBBARD FRANCIS A.
分类号
H04M3/64
主分类号
H04M3/64
代理机构
代理人
主权项
地址
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