| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem with practice of swinging a baseball bat that it is difficult for a practicer to judge whether the practicer is swinging a bat correctly or not and the practicer is often bored due to monotonousness. SOLUTION: The air sound ring is a rubber ring (1) having a cavity (3) in the interior and a plurality of holes (2) on the side, and is mounted on a bat (4). The air sound ring generates a sound when the bat is swung. COPYRIGHT: (C)2006,JPO&NCIPI
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