BELL SYSTEM AND WESTERN UNIONS TELETYPE MACHINES WERE THE  WORK HORSES OF THE COLD WAR BOTH WERE HEAVILY RESPONSIBLE FOR  GUIDANCE SYSTEMS ON ROCKETS TO RADIO FREQUENCYS FOR SUBMARINES SUBMERGED THE COLD WAR PROVIDED A NEED FOR COMUNICATION NETWORKS AND THESE COMPANYS WERE RESPONSIBLE AND WERE ABLE TO INVENT BETTER COMMUNICATION SYSTEMS BECAUSE TECHNOLOGY WAS A NUMBER ONE NECESSITY DURING THE 1950s-1970s THESE SYSTEMS HAD ALOT OF RESPONSIBILITY TO MAKE SURE  DURING ATTACK LAUNCH COMMANDS AND BOMBER CREWS GOT CORRECT INFO DURING  EXERCISES AND IF NEED BE ATTACK.