Problem description:
1. Who invented the refrigerator?
Who invented the tape recorder in which year?
Who invented the sofa in which year?
4. Who invented the loudspeaker in which year?
5. Who invented the range hood in which year?
6. Who invented the electric fan in which year?
Analysis:
In 1 and 1877, the first gas cooler, the prototype of the refrigerator, was made by the Frenchman Kellett. German engineer Karl von Linde made the first household refrigerator in 1879. However, there are many theories about the invention of refrigerators. For example, 19 13 was born in Chicago, USA, and the household refrigerator named Domelre was the first one. It is widely said that Swedish engineers Balser von Plantan and Karl Mont took the lead in making the first refrigerator and sold the patent right to the American company Ronghua Company. However, they invented the refrigerator in 192 1, 1923, 1926 respectively.
2. Inventors of tape recorders: Marvin Kamras in the United States and Moore in Germany (1935).
Who invented the sofa in which year? Ask who is uncomfortable sitting in a chair, add something soft and it will gradually become a sofa. But sofas are very popular now, and people always rob them, even the benches.
I don't know, it's hard to find relevant information now. There are so many brand manufacturers that I don't know who will be the first.
5. I don't know when the world's number one range hood was invented, and I don't know who invented it. It may be too modern, and I don't know who invented it. But Chinese mainland's first range hood, 1987, was born in July.
6, the invention of the electric fan, it is difficult to find relevant information now. It is said that in 1882, Huey Skats Hoyla, the chief technician of Croca Zhikazis Engine Factory in new york, USA, first invented the commercial electric fan. The next year, the factory began mass production. At that time, the electric fan was a desktop fan with only two blades. 1908, American ek engine electric company successfully developed the world's earliest gear-driven electric fan with left and right shaking heads. This kind of electric fan eliminates unnecessary 360-degree air supply and becomes the mainstream of future sales.