| 摘要 |
This invention relates to an improved mechanical pencil. More particularly, the invention concerns a mechanical pencil in which the back and forth movements of a writing implement are controlled by a carrier having a spiral guide travelling along the spiral grooves formed on the inside of the pencil barrel, the carrier being adapted to travel along the spiral grooves formed on the inside of the pencil barrel in response to the manual rotations of the cap holding one end of the supporting member.
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