People used to pin pages together. But the needle will damage the paper, and it will also stab the user's fingers. A Norwegian inventor named John E. Walker thought he could solve this problem. 190 1 year, he filed a patent application for steel wire paper clips (Waller applied for a patent in Germany because there was no patent application system in Norway).
Advantages of lengthening data paper clips
1 as a bookmark. Sometimes after reading a book, many people will fold the pages to make a mark, but this will cause some damage to the pages and be unsightly. In fact, it is also possible to use paper clips as bookmarks. This technique is simple, beautiful and practical.
2. Close the food bag. When you usually eat snacks, you can't eat them all at once. Open snacks are easy to get wet and soften, which affects the taste. With paper clips, snacks can avoid getting wet, even if they are kept for a day or two.
3. mobile phone card pin. At present, the slots of mobile phone cards are all on the side of mobile phones. To open it, you must use the phone card pin, and the paper clip can be used as the phone card pin.
4, anti-theft. When going out, thieves can easily steal things from their backpacks, which will bring great losses, but we can't always be wary of thieves. Paper clips can also strengthen the zipper of our backpacks to avoid being stolen. After the thief used the paper clip, he couldn't unzip the zipper for a short time when he stole again, but it was enough to react during this time.
Baidu encyclopedia-paper clip