Combined staging bracket and double sided clamp back rail
作者： Donald G. Rondeau
DOI:
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摘要:
lens.org 参考文章(5)
Roger J. Nietling, Apparatus for applying shingles to a roof ,(1992)
Michael B. Fahy, Modular staging with platform jacks ,(1976)
Maurice Shaffstall, Adjustable roof scaffold jack ,(1986)
James H. Myers, Safety guard apparatus ,(1990)
Edward E. Judge, Norman R. Judge, Brake drum micro-finishing apparatus ,(1992)