Most service points of Western Union work in the time convenient for customers throughout the week and throughout the year. In 1877, starting from September, New York City residents began to have the opportunity to check the time on clock with the "time ball", located on the roof of constructed in the same year a new corporate headquarters - Western Union Building. 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 April 1851 companions registered in Albany New York and Mississippi Valley Printing Telegraph Company (NYMVPTC), which included founded two years before New York State Printing Telegraph Company. In 1849, Selden and Sibley, the founders of the future Western Union, created the New York State Printing Telegraph Company. Number of active holders of "Golden Card" of Western Union amounted to 9.5 million people worldwide.