In the early forties of the 20th century, Western Union has used the first time a commercial intercity microwave transmission system. Most service points of Western Union work in the time convenient for customers throughout the week and throughout the year. One of the common kinds of money transfer is a transfer via the international system of Western Union. In 1879 Western Union left the telephone business after losing a lawsuit against Alexander Graham Bell - the patent holder on the phone. Western Union made so that the time in all of American civil services was the same.