ONORM A 2136-1989 Mechanical drawing pencilsfor educational purposes《教学用自动铅笔》.pdf

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JIS S6005-2000 自动铅笔的笔芯.pdf

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CNS 7079-1981 Sharp Pencil《自动铅笔》.pdf

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CNS 7081-1981 Lead for Sharp Pencil《自动铅笔用笔蕊》.pdf

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GOST 19445-1993 Mechanical pencils Part 1 Classification dimensions performance requirements and testing《自动铅笔 第1部分 分类、尺寸、技术要求及试验方法》.pdf

ONORM A 2137-1989 Black leads for mechanical drawing pencils for educational purposes《教学用自动铅笔黑色铅芯》.pdf

SANS 9177-3-2009 Mechanical pencils Part 3 Black leads - Bending strengths of HB leads《制图自动铅笔 第2部分：石墨 HB铅笔芯弯曲强度》.pdf

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