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发明名称
Telephone system
摘要
申请公布号
US2241016(A)
申请公布日期
1941.05.06
申请号
US19390300140
申请日期
1939.10.19
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KING GERALD V.;KORN FRANKLIN A.;MCALPINE RODERICK K.
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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