Abstract :
Starting with a few small offices more than 35 years ago, the use of the rotary automatic telephone system of the power-driven type has extended to practically all parts of the world. Today it is standard equipment for many of the leading administrations and telephone operating companies and now is being introduced for the first time into two of the major independent telephone systems in the United States. The initial installations in the United States involve the conversion from manual to automatic operation of a 15,000-line central office at Rochester, N. Y., in July 1948, and the main central office of about the same size at Lexington, Ky.
