| http://www.w3.org/ns/prov#value | - Moreover, the configuration of the side portions 2A and 2B, the top portion 3, and the yoke portion 4 are set as given below, and based on such settings, the sweet area SA shown by hatched lines in FIG. 1 is located at the central portion of the ball striking face F, while the center point P of said sweet area SA is set at the center position of the ball striking face F, i.e. at the position of th
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