Oxygen:Oxygen was discovered about 1772 by a Swedish chemist, Carl Wilhelm Scheele, who obtained it by heating, mercuric oxide, and many other substances.
Telivision: Philo Taylor Farnsworth successfully demonstrated the first television signal transmission on September 7, 1927 with his own scanning tube.
Compter: Adam Osborne founded Osborne Computer and formed the Osborne 1 in 1981. The Osborne 1 had a five-inch screen, incorporating a modem port, two floppy drives, and big collection of bundled software applications.