| 摘要 |
A device that puts a mark on a golf ball such that when the golf ball is struck by the golf club head, the mark is transferred to the club head face. The golfer can the n see by inspecting the mark on the golf club head, where the golf club head is contacting the ball and change the ball placement, golfers stance or golfers swing to hit the ba ll in the "sweet spot" area of the golf club head.
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