发明名称 Ladder leveling device
摘要 A ladder leveling device is disclosed by which one or both legs of the leveling device are adapted to be elongated to provide an upright and continuously stable position for the ladder on sloping or an irregular base.
申请公布号 US4014406(A) 申请公布日期 1977.03.29
申请号 US19760685736 申请日期 1976.05.13
申请人 EASTON, JAMES FRED 发明人 EASTON, JAMES FRED
分类号 E06C7/44;(IPC1-7):E06C7/44 主分类号 E06C7/44
代理机构 代理人
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