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ISO 9177-3:2022
M00004469
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ISO 9177-3:2022 Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads
standard by International Organization for Standardization, 02/01/2022
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This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.