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发明名称
Improvements in or relating to ladders
摘要
申请公布号
GB705682(A)
申请公布日期
1954.03.17
申请号
GB19510007609
申请日期
1951.04.02
申请人
BENJAMIN JOHN UREN
发明人
分类号
E06C7/42
主分类号
E06C7/42
代理机构
代理人
主权项
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