In the early forties of the 20th century, Western Union has used the first time a commercial intercity microwave transmission system. The presence of Western Union Gold Card at the client greatly simplifies the process of further processing of money transfers of and reduces the operation time for the sending of money, as the "Gold Card" is a carrier of the personal information about the client. In the 30's of the twentieth century, Western Union has become the world's largest telegraph company. To obtain the Golden card can any client of Western Union, committing money transfers on this system more than 1 time per year. Getting the card is issued at the time of making of the next transfer. In 1914 Western Union engineers invented the first payment card - a prototype of the modern credit card. Number of active holders of "Golden Card" of Western Union amounted to 9.5 million people worldwide.