Vehicle loading ramp displacement apparatus
作者： Billy D Rayle , Harold C Flinchum , Lloyd W Reid
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摘要: Apparatus for facilitating the displacement of loading ramps pivotably mounted upon a vehicle includes an electrically operated winch mechanism connected to boom, boom being and attached through flexible connectors.
lens.org 参考文章(2)
Allen Louis Lynn, Collapsible tail-gate ramp for trucks ,(1952)
Evatt A Mccleneghan, Transporter of tractors and other equipment ,(1940)