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发明名称
Precast concrete step
摘要
申请公布号
US3216160(A)
申请公布日期
1965.11.09
申请号
US19630272348
申请日期
1963.04.11
申请人
BEST HAROLD A
发明人
BEST HAROLD A.
分类号
E04F11/028
主分类号
E04F11/028
代理机构
代理人
主权项
地址
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