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发明名称
Telephone system
摘要
申请公布号
US2259101(A)
申请公布日期
1941.10.14
申请号
US19400335240
申请日期
1940.05.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
DAVIS RICHARD C.;NEWSOM JAMES B.;STRICKLER WALTER B.
分类号
H04M3/60;H04Q3/00
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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