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发明名称
Rail crossing
摘要
申请公布号
US1775661(A)
申请公布日期
1930.09.16
申请号
US19280297981
申请日期
1928.08.07
申请人
CONTINUOUS RAIL CROSSING CORPORATION
发明人
WHALEN WILLIAM H.
分类号
E01B7/30
主分类号
E01B7/30
代理机构
代理人
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