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发明名称
Telephone system
摘要
申请公布号
US2164335(A)
申请公布日期
1939.07.04
申请号
US19380201756
申请日期
1938.04.13
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MATHES ROBERT C.
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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