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发明名称
Telephone system
摘要
申请公布号
US2206538(A)
申请公布日期
1940.07.02
申请号
US19380231477
申请日期
1938.09.24
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
RHODES WILLIAM A.
分类号
H04Q1/453;H04Q3/00;H04Q5/06
主分类号
H04Q1/453
代理机构
代理人
主权项
地址
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