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发明名称
Method and means for electrical signaling and control
摘要
申请公布号
US1885009(A)
申请公布日期
1932.10.25
申请号
US19190273054
申请日期
1919.01.25
申请人
DAY ALBERT V T
发明人
DAY ALBERT V. T.
分类号
H04J9/00
主分类号
H04J9/00
代理机构
代理人
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