component - a part of a large assembly , especially a part of machine ,robot or vehicle ; for example a wheel, a motor,etc, chassis - the base frame of a car , carriage or other wheeled vehicles , plan view - a 2D view from looking directly down on a 3D object , castor wheel - a undriven wheel that is attached to an object or vehicle to allow it to move; they can typically rotate 360 degrees, castor ball - an undriven ball that is attached to an object or vehicle to allow it to move; they typically rotate in all directions,

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