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发明名称
Telegraph system
摘要
申请公布号
US1852050(A)
申请公布日期
1932.04.05
申请号
US19310543916
申请日期
1931.06.12
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
HAMILTON BAXTER P.
分类号
H04L5/06;H04L25/04
主分类号
H04L5/06
代理机构
代理人
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