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发明名称
Stepladder
摘要
申请公布号
US2347065(A)
申请公布日期
1944.04.18
申请号
US19420436292
申请日期
1942.03.26
申请人
RALPH RIGBY
发明人
RIGBY RALPH
分类号
E06C1/20
主分类号
E06C1/20
代理机构
代理人
主权项
地址
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