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Priority to GEAP2011012082priorityCriticalpatent/GEP20125651B/en
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A crane running unit comprises a running wheel 1 with bearings 2 mounted in a rim, an axis 3, a cylindrical rack wheel 4 rigidly fastened to the running wheel, a limiter 5 of the wheel axial motion, cups 6 with antifrictional bushings 7 that are mounted within the internal ring of the bearings with free motion capability.