Adjustable stretching step
作者： William T. Wilkinson
DOI:
关键词:
摘要: A stretching step with a perimeter skirt circumscribing the platform and height of one end can be varied by means cylinders formed in telescoping legs which interact are positioned spring lock pins holes or an alternated to vary plurality opposite sides U-bar that is inserted corresponding rest notches bottom edge obtain different adjustments.
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