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2020-05-26
The most important thing to learn is to choose a pen. The pen and neutral pen are commonly used, which can be confusing....
Factory exploration: ball point pen with small figure and great wisdomFirst of all, the nib is divided into two parts, a...
2020-05-26
H and B are the hardness marks on the pencil holder. H means hard pencil. The larger the number in front, the greater th...
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