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| GB/T 39542.2-2020 Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions (English Version) |
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Detail of GB/T 39542.2-2020
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Introduction of GB/T 39542.2-2020
GB/T 39542.2-2020 Mechanical pencils for technical drawings—Part 2:Black leads—Classification and dimensions English
Contents of GB/T 39542.2-2020