Another cause of sore throat is allergies that promote postnasal drip. There are, however, more serious conditions of the sinuses and throat that may cause the throat to be sore. If you are experiencing an ongoing sore throat, ask your ear, nose, and throat specialist to examine you.
1907: Samuel Simon patented the first screen printing method in Manchester, England, which was most commonly applied to wallpaper and expensive fabrics. He used rubber bands or squeegees, which are still commonly used in the screen printing process today.
However, there are a few moments in the history of computer printers that have become reference dates and changed the course of history. In 1938, Chester Carlson invented a dry printing process called electrophotography, commonly called a Xerox, the foundation technology for laser printers to come. This device opened the way for the laser printer, one of the most common types of printers up to this day.