COIN (VERSIONS) Russian patent published in 2001 - IPC

FIELD: state monetary circulation. SUBSTANCE: coin has at least one through and/or dead openings offset with respect to coin center. Openings are made in the form of closed wrench span. Opening may be made in the form of rectangular or curved slot. Slot edges are made chamfered. Millimeter and/or degree divisions with sequential designations of length and/or angle values are applied to chamfered edges and/or to peripheral coil edge. Opening may be made in the form of curved or stepped recess defining flexible members in the plane of coin disk. Flexible members are capable of effecting free vibrations. EFFECT: improved consumer properties and additional degree of protection from counterfeit. 4 cl, 7 dwg