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发明名称
Road covering
摘要
申请公布号
US2174264(A)
申请公布日期
1939.09.26
申请号
US19350032927
申请日期
1935.07.24
申请人
KARL HALBACH
发明人
HALBACH KARL
分类号
E01C7/12
主分类号
E01C7/12
代理机构
代理人
主权项
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