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经营范围
发明名称
Self-levelling ladder
摘要
申请公布号
US2890823(A)
申请公布日期
1959.06.16
申请号
US19540433779
申请日期
1954.06.01
申请人
BENDICK JACK W
发明人
BENDICK JACK W.
分类号
E06C7/44
主分类号
E06C7/44
代理机构
代理人
主权项
地址
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