Wheel-axle combinations, e.g. wheel sets (units comprising multiple wheels arranged side-by-side B60B11/00; rail vehicle axle-boxes B61F)

Child Classifications

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• B60B 37/02 the wheels being integral with solid axles
• B60B 37/04 the wheels being rigidly attached to solid axles
• B60B 37/06 the wheels being integral with, or rigidly attached to, hollow axles
• B60B 37/10 the wheels being individually rotatable around the axles
• B60B 37/12 Axles with a fixed ground wheel and a loose wheel