샤프연필?제3부: 흑연 심?HB심의 굽힘 강도
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2017-09-13

제도용 기계식 연필 — 제3부: 흑연 심 — HB 심의 굽힘 강도
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2023-06-23

技术制图活动铅笔 第3部分：黑铅芯 HB铅芯弯曲强度
Mechanical pencils for technical drawings—Part 3: Black leads—Bending strengths of HB leads

2020-07-21

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2022-01-26

Mechanical pencils - Part 3: Black leads; bending strengths of HB leads; identical with ISO 9177-3:1994
机械铅笔.第3部分:黑色铅笔芯；HB导线的弯曲强度；与ISO 9177-3:1994相同

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