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发明名称
Road construction
摘要
申请公布号
US2181670(A)
申请公布日期
1939.11.28
申请号
US19380220380
申请日期
1938.07.20
申请人
SHAW RICHARD J
发明人
SHAW RICHARD J.
分类号
E01C3/00
主分类号
E01C3/00
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代理人
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