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New type of superconducting material is presented in form of thin composite mono- and multilayers (multifilamentary) sheets based on Bi-2223 compound in metal matrix. Such sheets with 0.2-1.0 mm in thickness, up to 300 mm in width and up to 10 m in length contain up to 20 thin superconducting layers (or filaments). Different testing methods are applied in order to estimate the superconducting properties...