In the Western Union in the 30s of the 20th century worked 14 thousand couriers delivering telegrams. In the early 60s Western Union has put into operation transcontinental microwave system of data transmission via radio waves, completely replacing the web of telegraph poles and wires. In 1849, Selden and Sibley, the founders of the future Western Union, created the New York State Printing Telegraph Company. In 1884 Western Union has become a joint-stock company and was brought to the stock exchange. The company has entered in the first American stock index Dow Jones.