Vehicle step arrangement

作者: Stanley B Fowler

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摘要: In a bus-type vehicle ingress and egress of passengers is carried out through door opening the upper portion which closed by swingably mounted lower step platform arrangement selectively movable between raised position wherein structure to either close or open provide high level for passenger at floor level, lowered it provides plurality steps ground level.

参考文章(2)
Brunolf C Baade, Retractable car step ,(1936)