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Screw or tapping screw

  • US 20060147296A1
  • Filed: 10/17/2003
  • Published: 07/06/2006
  • Est. Priority Date: 10/17/2002
  • Status: Abandoned Application
First Claim
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1. A screw or a tapping screw characterized in having an ultra fine structure of ferrite grains having a 3 μ

  • m or less average grain size and a nitride layer in a surface part.

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