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发明名称
Telegraph switching system
摘要
申请公布号
US2490666(A)
申请公布日期
1949.12.06
申请号
US19450612499
申请日期
1945.08.24
申请人
KELLOGG SWITCHBOARD AND SUPPLY COMPANY
发明人
BLYHOLDER ORLANDO
分类号
H04L12/04
主分类号
H04L12/04
代理机构
代理人
主权项
地址
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