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The auto industry followed the aircraft industry by reducing the bend radii, which ultimately led to a new machine equipment feature: Boost. This process, a pushing force that advances the tube into the bend die, gave manufacturers the ability to make several 1D bends in succession with no straight length between the bends. In other words, make a 1D bend, rotate the tube a bit, and make another 1D bend right after the previous one. Voila! A compound 1D bend.