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经营范围
发明名称
Protective system
摘要
申请公布号
US2338405(A)
申请公布日期
1944.01.04
申请号
US19410400890
申请日期
1941.07.03
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CASH CLAUDE C.;PERKINS KENNETH H.
分类号
H04L25/08
主分类号
H04L25/08
代理机构
代理人
主权项
地址
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