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An analogue of the concept of projective scheme is defined for noncommutative ℕ-graded algebras using the quotient category of graded right A-modules modulo its full subcategory of torsion modules. We define proj A = (, , s), where is the object corresponding to the module AA, and s is the autoequivalence defined by the shift of degrees. The triples equivalent to proj A for a right noetherian graded algebra A are characterized in terms of a condition on extensions.