| 摘要 |
A putter with a ball-striking face and a rear portion in relation to this face, which has a fin on the rear face which is inclined with regard to the line between ball and hole in such a way that the direction of some of its edges indicates the trajectory to be followed in the backswing through the inside area in relation to the position of the player. The fin can be replaced by an obvious, clear mark made on the putter in the appropriate direction.
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