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                                   The
                                      radial celarance of deep groove ball bearings
                                      are according with GB4604-93 which is adopted
                                      from ISO5753-1991 equivalently, divided
                                      into five groups as shown in Table 6. 
                                    Extra
                                      small and miniature ball bearings also provides
                                      radial clearances in six groups as shown
                                      in Table 7. 
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