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发明名称
Highway crossing
摘要
申请公布号
US2089025(A)
申请公布日期
1937.08.03
申请号
US19330660491
申请日期
1933.03.13
申请人
AMERICAN STEEL FOUNDRIES
发明人
HEDGCOCK WILLIAM C.
分类号
E01C9/04
主分类号
E01C9/04
代理机构
代理人
主权项
地址
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