| 摘要 |
PROBLEM TO BE SOLVED: To provide a spherical material suppressing the inclination of the material in grinding or the like. SOLUTION: The spherical material 45 having a spherical body part 51 comprises: a first protruded belt part 46 having a ring shape formed on the body part 51; and second protruded belt parts 47 having a ring shape formed on the surface of the body part 51 and on both sides with the first protruded belt part 46 as the boundary. COPYRIGHT: (C)2010,JPO&INPIT
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