Easy way up

This sight held our attention from start to finish. A flatbed truck with some sort of folding device on it, along with stacks and stacks of shingles, backed tidily into a driveway. The device rose, unfolded, and extended itself. It was a sort of paternoster or shingle elevator, complete with motor and continuous loop. In fact, it does appear to be called a shingle elevator. Guys on the truckbed were throwing bundles of shingles on it as fast as they could, and guys up on the roof were unloading and stacking just as quickly. This sure beats a shoulder-tote up an extension ladder.