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发明名称
Method and means of electrically connecting rails
摘要
申请公布号
US1757973(A)
申请公布日期
1930.05.13
申请号
US19280247329
申请日期
1928.01.17
申请人
THE OHIO BRASS COMPANY
发明人
MEAD GEORGE A.
分类号
E01B11/50
主分类号
E01B11/50
代理机构
代理人
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