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Golf clubhead

  • US 20030064823A1
  • Filed: 09/19/2002
  • Published: 04/03/2003
  • Est. Priority Date: 09/28/2001
  • Status: Active Grant
First Claim
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1. A golf clubhead comprising a face portion having a back surface, said back surface provided around a center region thereof with at least two annular grooves so that said face portion is provided with at least two annular thin parts each being thinner than the center region and at least one rib part between the thin parts.

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