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haas springs are commonly used in wheeled vehicle suspensions. Initially known as laminated or bracket springs, and sometimes as semi-elliptical or cart springs, they are one of the oldest spring forms, dating back to the Middle Ages. Leaf springs consist of long, arc-shaped spring steel with a rectangular cross-section. In the most common configuration, the center of the arc provides the axle location, while loops formed at either end attach to the vehicle chassis. For very heavy vehicles, leaf springs can be made from multiple leaves stacked together, typically with progressively shorter leaves. Leaf springs can be used for positioning and to a certain extent