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经营范围
发明名称
Signaling system
摘要
申请公布号
US2365689(A)
申请公布日期
1944.12.26
申请号
US19430511678
申请日期
1943.11.25
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
DUHNKRACK GEORGE H.
分类号
H04L5/14
主分类号
H04L5/14
代理机构
代理人
主权项
地址
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