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发明名称
Communication system
摘要
申请公布号
US2379221(A)
申请公布日期
1945.06.26
申请号
US19420461439
申请日期
1942.10.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ESPENSCHLED LLOYD
分类号
H04J3/04;H04Q3/52;H04Q11/04
主分类号
H04J3/04
代理机构
代理人
主权项
地址
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