| 摘要 |
PROBLEM TO BE SOLVED: To provide a polishing method for pachinko balls capable of removing stains stuck to the surface of the pachinko ball in a short time. SOLUTION: In the polishing method for the pachinko balls, beads for blasting whose diameter is smaller than the one of the pachinko ball are jetted to the pachinko balls moving on a lattice board (43) arranged inside a pachinko island (11). COPYRIGHT: (C)2004,JPO&NCIPI
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