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  • CN 2,681,909 Y
  • Filed: 03/30/2004
  • Issued: 03/02/2005
  • Est. Priority Date: 03/30/2004
  • Status: Active Grant
First Claim
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1. , a kind of novel file, it comprises clamp (1), open and close device (2), open and close device (2) is located at clamp (1) middle part, it is characterized in that open and close device (2) is made up of two strip symmetries, the rectangular stick in its cross section.

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