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A technical sketch showing a delivery truck with an open bi-folding rear ramp, accompanied by multiple detailed drawings of the ramp mechanism.

A technical sketch showing a delivery truck with an open bi-folding rear ramp, accompanied by multiple detailed drawings of the ramp mechanism.

A box delivery truck with a bi folding ramp on rear coving half the width of the rear overhead door show multiple drawings of it in the down position for easy delivery ramp covering half the width of the rear overhead door. Then show it folding in the up position bi-folding in front of the closest overhead door See more