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sklademVydáno: 2022-01-26
ISO 9177-3:2022
ISO 9177-3:2022 - Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
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| Označení normy: | ISO 9177-3:2022 |
| Vydání: | 2 |
| Vydáno: | 2022-01-26 |
| Počet stran (Anglicky): | 4 |
DESCRIPTION
ISO 9177-3:2022
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.