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发明名称
Telegraphic communication system with automatic answer back and alarm signals
摘要
申请公布号
US2474257(A)
申请公布日期
1949.06.28
申请号
US19430515562
申请日期
1943.12.24
申请人
KLEINSCHMIDT EDWARD E
发明人
KLEINSCHMIDT EDWARD E.
分类号
H04L12/06
主分类号
H04L12/06
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代理人
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