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发明名称
Selective signaling system
摘要
申请公布号
US2553910(A)
申请公布日期
1951.05.22
申请号
US19470787790
申请日期
1947.11.24
申请人
POLYTECHNIC RESEARCH AND DEVELOPMENT COMPANY INCORPORATED
发明人
GAFFNEY FRANCIS J.;FINKE HERBERT A.
分类号
H04W88/02
主分类号
H04W88/02
代理机构
代理人
主权项
地址
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