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About This Item

 

Full Description

Specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.

 

Document History

  1. ISO 9177-3:2022


    Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads

    • Most Recent
  2. ISO 9177-3:1994

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    Mechanical pencils -- Part 3: Black leads -- Bending strengths of HB leads

    • Historical Version