| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball with a built-in metronome as a toy useful for promoting the health of mind and body of persons of various generations. <P>SOLUTION: A ball 1 like a beanbag has a compact built-in metronome 3 covered with a shock absorbing material 2. <P>COPYRIGHT: (C)2009,JPO&INPIT |
