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Road construction
摘要
申请公布号
US2259374(A)
申请公布日期
1941.10.14
申请号
US19380233992
申请日期
1938.10.08
申请人
GRAMELSPACHER CLARENCE U
发明人
GRAMELSPACHER CLARENCE U.
分类号
E01C5/14
主分类号
E01C5/14
代理机构
代理人
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