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GB/T 43550.2-2023
Mechanical pencils and lead for general use - Classification, dimensions, quality and test methods - Part 2: Black lead
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 - 英文版
GB/T 43550.1-2023
Mechanical pencils and lead for general use - Classification, dimensions, quality and test methods - Part 1: Mechanical pencils
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 - 英文版
GB/T 39542.1-2020
Mechanical pencils for technical drawings—Part 1: Classification, dimensions, performance requirements and testing
技术制图活动铅笔 第1部分:分类、尺寸、性能要求和试验 - 英文版
GB/T 39542.2-2020
Mechanical pencils for technical drawings—Part 2: Black leads—Classification and dimensions
技术制图活动铅笔 第2部分:黑铅芯 分类和尺寸 - 英文版
GB/T 39542.3-2020
Mechanical pencils for technical drawings—Part 3: Black leads—Bending strengths of HB leads
技术制图活动铅笔 第3部分:黑铅芯 HB铅芯弯曲强度 - 英文版
GB/T 26698-2011
Pencils and Mechanical pencils for exam
考试用铅笔和涂卡专用笔 - 英文版

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