| 摘要 |
PURPOSE: A ballpoint pen is provided, which can be utilized in grasping the quantity of the goods and checking quantity on a list. CONSTITUTION: A ballpoint pen includes a ballpoint pen body, a ballpoint pen lead, and a ballpoint pen button. A liquid crystal device is arranged between the ballpoint pen lead and ballpoint pen button in the ballpoint pen body. According to the push operation of the ballpoint pen lead, the push number corresponding to push frequency is marked on the liquid crystal device. The liquid crystal device consists of a liquid crystal contact portion which comes into contact with the ballpoint pen button and ballpoint pen lead; and a liquid crystal number pad indicating the push frequency. |
