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发明名称
Reinforced track crossing
摘要
申请公布号
US2121659(A)
申请公布日期
1938.06.21
申请号
US19360084582
申请日期
1936.06.10
申请人
EUGENE GRAND JEAN FRANCOIS;LUCIEN GRAND RENE
发明人
GRAND JEAN FRANCOIS EUGENE;GRAND RENE LUCIEN
分类号
E01B7/28
主分类号
E01B7/28
代理机构
代理人
主权项
地址
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