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发明名称
A safety device that allows ladders to be used at right angles to stairways or on soft and/or sloping ground
摘要
申请公布号
GB0300960(D0)
申请公布日期
2003.02.12
申请号
GB20030000960
申请日期
2003.01.16
申请人
RODGERS, JOHN H
发明人
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主分类号
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