Mechanical pencil explained: A pen, similar in shape to a fountain pen, can be adjusted to expose or retract the lead at will.
Mechanical pencil made a sentence: 1. Most mechanical pencil can change the refill, and some cheap types can be discarded after use.
2. mechanical pencil can be divided into two basic types: one is to clamp the lead and push it forward with use, and the other is to just clamp the lead to avoid falling off.
3. mechanical pencil, the first spring, applied for a patent in 1877, followed by a spiral filled pencil in 1895.
4. Do you think mechanical pencil should be updated?
5. 19 15 years, TokujiHayakawa, a newly-started metallurgical worker, made some improvements to mechanical pencil and made it successful.
6. Two automatic pencil sharpeners are placed opposite to each other, and the pencil is automatically cut into two cones with the help of the extrusion device.
7. Buy a big candle and carve some special slogans on it with mechanical pencil without lead core.
8. On the other hand, the long-term market is gradually increasing. Because the pen feels good, ballpoint pens, mechanical pencil ballpoint pens and four-color ballpoint pens are also favored.
9. In 2000, Lamy's pen was quickly published by ballpoint pen, mechanical pencil, four-color ballpoint pen and several really special problems.
10. In the past few years, I have never seen mechanical pencil in China in the early stage of modernization.
1 1. Learn about mechanical pencil and need to write from a calligrapher in a free art video.
12. On the shiny desk, school supplies are littered, notebook paper is littered, and mechanical pencil and a pink eraser are among the books in various subjects.
13, general preference item approval, pencil marking, symmetrical puzzle, automatic timer closing, etc.