SNI 12-0512-1989 Writing pencils and technical drawing pencils 《写字铅笔与技术绘图铅笔》.pdf

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STAS 4976-1966 《制作铅笔的椴木板》.pdf

JIS S 6006-2007 Pencil coloured pencils and leads for them《铅笔、彩色铅笔及其笔芯》.pdf

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