| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a golf ball improved so that a golf ball rolling trajectory is not only straight but also bent drawing a curve in putting practice. <P>SOLUTION: A high specific gravity metallic cylinder is buried from the surface of a golf ball to the center into a part near the surface without projecting out from the upper surface. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
