A multiple level elevating cot adapted to be rolled into emergency vehicles, the cot having a wheeled undercarriage supporting a cot frame having a leading end and a trailing end, The leading end comprises a drop frame adapted to be positionable in extended, middle, collapsed, and lengthened positions....http://www.google.ca/patents/US7302718?utm_source=gb-gplus-sharePatent US7302718 - Multiple level roll-in cot
