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发明名称
Convertible ladder
摘要
申请公布号
US3100552(A)
申请公布日期
1963.08.13
申请号
US19610090690
申请日期
1961.02.21
申请人
HENRY HOPFELD
发明人
HOPFELD HENRY
分类号
E06C1/32
主分类号
E06C1/32
代理机构
代理人
主权项
地址
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