标准编号：ISO 9177-3:2022
中文名称：制裁图用自动铅笔 第3部分：黑铅 HB铅芯的弯曲强度
英文名称：Mechanical pencils for technical drawings — Part 3: Black leads — Bending strengths of HB leads
发布日期：2022-01
标准范围
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
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