After changing, remember to adjust the color concentration, pull out the drum and put it back in again
Xerox is a famous trademark and brand of the American Xerox Company. Xerox Corporation was founded in 1906 in Fairfield County, Connecticut, USA. As a trademark, "Xerox" is used only to identify Xerox's various products and services. The "Xerox" trademark is placed in front of a noun to describe it: such as Xerox copiers, Xerox printers, etc.
A patent attorney and amateur inventor made the first successful invention on October 22, 1938, in a simple laboratory in Astoria, Queens, New York City. The first xerographic image was produced. He spent several years trying to sell the patent but failed. At that time, company managers and entrepreneurs did not believe that with carbon copy paper, there would be a market for copiers. Moreover, the prototype copiers at that time were so bulky and ugly.