According to the records of the U.S. Patent Office,1the late 9th century was the stage when the United States bid farewell to the introduction of pure technology and the patented technology advanced by leaps and bounds. From 1789 to 1800, the government issued 276 patents; 1850- 1860 10, the number of patents increased to 25,200, with an average of more than 2,000 per year; In the 20 years before 1900, the number of patents reached more than 20,000 each year, an increase of more than 10 times.
The second industrial revolution: the main invention of America;
1. 1876, Bell, a Scot who settled in Boston, USA, tried to make a phone call successfully.
Edison (invented the electric light, phonograph, etc. ) and others made important improvements on the basis of Bell's invention, which made telephone communication popular in many countries in the world.
The first telephone exchange was built in America.
3. 1879, Edison successfully developed a durable carbon filament light bulb.
4. 1896, Henry Ford, an American, made his first four-wheel car and Ford Model T production line.
5. 1903, 12. 17. The "Flyer" plane designed and manufactured by wilbur wright and Orville Wright in the United States successfully made a test flight in Kitty Hawk, Carolina.
This is recognized as the world's first mobile manned power plane flying into the sky.