Simplified printing telegraph switching and integrated data processing

Receiving and transmitting printing telegraph equipment, whether used in the simplest or the most complex circuit, has generally required some form of auxiliary equipment for switching and remote control. In many cases this auxiliary equipment is complex, costly, and requires as much space and electric power as the controlled equipment. A new concept in printing telegraph switching equipment has been realized in the development of the Teletype model 28 typing unit which may be utilized to perform many electrical and mechanical functions for selective calling, remote control, integrated data processing, and other special functions.