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发明名称
Electrical communication switching system
摘要
申请公布号
US2695333(A)
申请公布日期
1954.11.23
申请号
US19500181394
申请日期
1950.08.25
申请人
DENIS HARPER SAMUEL
发明人
HARPER SAMUEL DENIS
分类号
H04J3/00;H04J3/04;H04Q11/04
主分类号
H04J3/00
代理机构
代理人
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