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In page Amusement park:

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There is a core set of flat rides which most amusement parks have, including the Enterprise, Tilt-A-Whirl, Gravitron, chairswing, swinging inverter ship, twister, and top spin. However, there is constant innovation, with new variations on ways to spin and throw passengers around appearing in an effort to keep attracting customers. Manufactures such as Huss and Zamperla specialise in creating flat rides among other amusement attractions.[citation needed]