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特許 権利維持 PROBLEM TO BE SOLVED: To provide a nano-projection structure expectable of extensive application use by making further improvements to a conventional nano-projection structure. ; SOLUTION: This invention relates to the nano-projection structure formed of a projection 2 grown by irradiation of a high energy beam to metal copper 3 under rough vacuum, and formed in a bent, curved, or spiral coil shape by a change in the radiation direction of the beam in the middle of the growth.