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经营范围
发明名称
Ladder structure
摘要
申请公布号
US1799089(A)
申请公布日期
1931.03.31
申请号
US19290401803
申请日期
1929.10.23
申请人
CLARK FRED N
发明人
CLARK FRED N.
分类号
E06C9/08
主分类号
E06C9/08
代理机构
代理人
主权项
地址
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