Collapsible stair with foldable ramp
作者： Yvonne Tagart , Wallace Tagart
DOI:
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摘要: A collapsible stair with foldable ramp can include a first step, and second step nestable within the such that when is in closed position aligned an open lateral offset between increased. third be rotatably coupled to rotate from position, wherein comprises being covered by ramp.
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