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发明名称
Building roads
摘要
申请公布号
US1756344(A)
申请公布日期
1930.04.29
申请号
US19280290041
申请日期
1928.07.02
申请人
KARL DAMMANN
发明人
DAMMANN KARL
分类号
E01C7/35
主分类号
E01C7/35
代理机构
代理人
主权项
地址
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