A headline for June 21, 1963, read: WASHINGTON-MOSCOW HOT LINE T0 OPEN IN 60 DAYS The Times of London Service, Geneva: The agreement to establish a direct communication link between Washington and Moscow for emergencies was signed here yesterday by Charles Stelle of the United States and Semyon Tsarapkin of the Soviet Union. . . . The link, known as the hot line, will be opened within sixty days, according to U.S. officials. It will make use of leased commercial circuits, one cable and the other wireless, using teleprinter equipment.