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发明名称
Ladder leg extension
摘要
申请公布号
US2567989(A)
申请公布日期
1951.09.18
申请号
US19470780687
申请日期
1947.10.18
申请人
V. W. CHEEK
发明人
CHEEK MILLARD F.
分类号
E06C7/44;E06C7/46
主分类号
E06C7/44
代理机构
代理人
主权项
地址
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