| http://www.w3.org/ns/prov#value | - In this case, the sweet spot S is a point in which a perpendicular line dropped from a center of gravity in the head intersects the face surface, however, as a matter of convenience, may be determined as a position at which the head is balanced by being mounted on an upper end of a pipe, for example, having an inner diameter 1.5 mm and an outer diameter 2.5 mm in a state of directing the face surf
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