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发明名称
Road guard
摘要
申请公布号
US2204557(A)
申请公布日期
1940.06.18
申请号
US19390285630
申请日期
1939.07.20
申请人
AHLES CARL C
发明人
AHLES CARL C.
分类号
E01F15/06
主分类号
E01F15/06
代理机构
代理人
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