发明名称 Ladder leg extender and leveler
摘要 An improved ladder leg extender and leveler assembly including a frame structure which can be fixed in flush face-to-face relation to a ladder leg side so as to straddle rung fastener protrusions on the ladder leg side, thus avoiding bending stresses, the arrangement permitting quick and efficient assembly.
申请公布号 US4766976(A) 申请公布日期 1988.08.30
申请号 US19870090754 申请日期 1987.08.28
申请人 EMERSON ELECTRIC CO. 发明人 WALLICK, JR., CLAUDE R.
分类号 E06C7/44;(IPC1-7):E06C7/44 主分类号 E06C7/44
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