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发明名称
Telephone system
摘要
申请公布号
US2299212(A)
申请公布日期
1942.10.20
申请号
US19410400892
申请日期
1941.07.03
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
COLLIS RAYMOND E.;GETZ EMIL L.;HERSEY RALPH E.;KOPP OTTMAR H.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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