The present invention relates to a leaf spring that is applied to the mechanical and electronic parts , the inner ring and the outer ring It includes , and is composed of an inner ring and an outer ring member disposed between the plurality of bridges , the start site is located at a point between the bridge member of the outer ring and the inner ring , starting from the start site , respectively , and the same rotation direction have been made into two extensions extending in a coil shape surrounding the start site , the extension is characterized in that the inner ring and each connected to the outer ring
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