| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve (or properly impair) the rolling of a ball without changing the impact loft. <P>SOLUTION: A putter club head 10 comprises minute raised sections 17 at least at a part of one of upper or lower side surface of the sweet spot SS of its face surface 11 in a predetermined pattern and such that they are consecutively increased in height above the face surface 11 according to the distance from the sweet spot SS. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
