| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make the occupying rate of the area of the land parts to the total area in the imaginary spherical surface substantially zero when assuming the imaginary spherical surface on the top position level of each land part. <P>SOLUTION: In the golf ball, a plurality of ridge-shaped land parts extending straight or curved on a plane are arranged on the spherical surface and the land parts are combined to form numerous voids. <P>COPYRIGHT: (C)2004,JPO</p> |
