FIELD: data engineering. SUBSTANCE: core made for compression when band data medium is wound onto it is, essentially, round disk with central bore, external surface for winding, and carrier recesses on inner surface. Width of external surface receiving winding principally corresponds to that of data medium. Core configuration ensures ratio of diameter of central bore changed in compression to changed diameter of external surface maximum 1:4. EFFECT: provision for preventing deformation of central bore. 22 cl, 20 dwg, 2 tbl, 6 ex
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