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发明名称
Ladder step
摘要
申请公布号
US2709626(A)
申请公布日期
1955.05.31
申请号
US19510238156
申请日期
1951.07.23
申请人
WOODBURN HARRIETT M
发明人
WOODBURN HARRIETT M.
分类号
E06C7/16
主分类号
E06C7/16
代理机构
代理人
主权项
地址
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