| 摘要 |
PROBLEM TO BE SOLVED: To prevent unbalanced application of radial forces to a ring which has diamond grains electrodeposited on its external periphery and has a slit. SOLUTION: The ring has the diamond grains electrodeposited on its external periphery and the slit. A tool is characterized in that a longitudinal groove is added at the position equally dividing the circumference of the ring with respect to the slit. COPYRIGHT: (C)2007,JPO&INPIT
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