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In our everyday life, we can see inventions everywhere. It is so hard to imagine what life will be like w 1 these inventions, like cars, computers, televisions and zippers. Even the smallest inventions can make a big d 2 to our lives. The barcode(条形码)is one of the m 3 useful inventions. If you want to know the information of the goods, you can scan the barcode with your smartphone. But do you know how the barcode was i 4 ？Here is something about it.
In 1948, an owner of a small food store found i 5 difficult to record the inventory(详细目录)and prices of his goods. S 6 he turned to the Drexel Institute of Technology. He wanted to find a m 7 to solve the problem. The good news was that Bernard Silver took up the challenge and began w 8 on it. At last Bernard Silver and a group of students from the institute set up a barcode system to solve the problem. To p 9 the invention, Bernard and his classmate Woodland decided to get a patent(专利). It took them about three years. F 10 ，on October 7th, 1952, they got the patent. And the invention is more and more widely used in the world.
In our everyday life, we can see inventions everywhere. It is so hard to imagine what life will be like w
In 1948, an owner of a small food store found i
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