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发明名称
LOCKING DEVICE FOR BIDIRECTIONALLY FOLDABLE STEP LADDERS
摘要
申请公布号
GB9210472(D0)
申请公布日期
1992.07.01
申请号
GB19920010472
申请日期
1992.05.15
申请人
CHANG WAN LI
发明人
分类号
E06C1/383
主分类号
E06C1/383
代理机构
代理人
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