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经营范围
发明名称
Ladder extension
摘要
申请公布号
US2458076(A)
申请公布日期
1949.01.04
申请号
US19470734121
申请日期
1947.03.12
申请人
HOUSTON CHARLES O
发明人
HOUSTON CHARLES O.
分类号
E06C7/44
主分类号
E06C7/44
代理机构
代理人
主权项
地址
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