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发明名称
Telephone system
摘要
申请公布号
US2225305(A)
申请公布日期
1940.12.17
申请号
US19390289148
申请日期
1939.08.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KING GERALD V.;SWENSON PAUL W.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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