Mechanical pencils and leads for general use — Classification, dimensions, quality and test methods — Part 1: Mechanical pencils
通用机械铅笔和引线.分类 尺寸 质量和试验方法.第1部分:机械铅笔

2019-02-26

一般用途活动铅笔和铅芯 分类、尺寸、质量和试验方法 第1部分：活动铅笔
Mechanical pencils and leads for general use—Classification, dimensions, quality and test methods—Part 1: Mechanical pencils

2023-12-28

一般用途活动铅笔和铅芯 分类、尺寸、质量和试验方法 第2部分：黑铅芯
Mechanical pencils and leads for general use—Classification, dimensions, quality and test methods—Part 2: Black leads

2023-12-28