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发明名称
Folding stepladder
摘要
申请公布号
US2255756(A)
申请公布日期
1941.09.16
申请号
US19400329406
申请日期
1940.04.13
申请人
BIEGEN JOHN M
发明人
BIEGEN JOHN M.
分类号
E06C1/22
主分类号
E06C1/22
代理机构
代理人
主权项
地址
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