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发明名称
IMPROVED LADDER STILES
摘要
申请公布号
GB8923634(D0)
申请公布日期
1989.12.06
申请号
GB19890023634
申请日期
1989.10.20
申请人
CLARKE, JAMES B
发明人
分类号
主分类号
代理机构
代理人
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