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发明名称
Telegraph system
摘要
申请公布号
US2548720(A)
申请公布日期
1951.04.10
申请号
US19470795157
申请日期
1947.12.31
申请人
EDGAR GRETENER
发明人
GRETENER EDGAR
分类号
H04L19/00
主分类号
H04L19/00
代理机构
代理人
主权项
地址
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