ISO-9177-3 › Complete Document History
Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads
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2ND EDITION - Bending strengths of HB leads - Feb. 1, 2022
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Obsolete Revision Information: |
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1ST EDITION - Part 3: Black leads -- Bending strengths of HB leads - July 1, 1994
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