CNS 7079-1981 Sharp Pencil《自动铅笔》.pdf

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CNS 7080-1983 Method of Test for Sharp Pencils《自动铅笔检验法》.pdf

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CNS 7082-1983 Method of Test of Leads for Sharp Pencil《自动铅笔用笔芯检验法》.pdf

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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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