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M00018043
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ISO 9177-2:2022 Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
standard by International Organization for Standardization, 06/01/2022
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This document specifies a classification and dimensions for black leads used for mechanical pencils for technical drawings.
Two types of black leads are available: polymer leads (designated by the letter "P");ceramic leads (designated by the letter "C").