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经营范围
发明名称
Variable road widener
摘要
申请公布号
US3031938(A)
申请公布日期
1962.05.01
申请号
US19590797280
申请日期
1959.03.04
申请人
BERO JAMES D
发明人
BERO JAMES D.
分类号
E01C19/48;E02D3/046
主分类号
E01C19/48
代理机构
代理人
主权项
地址
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