Historical Film: Documentary about the manufacture, operation and uses of the vacuum tube (valve) made by AT&T.
World renowned at that time as the finest manufacturer of all types of electronic equipment, the AT&T organization was composed of AT&T itself, a long-distance telephone company; The Bell System, responsible for local telephone service; Bell Laboratories, a pure research-and-development think tank; Western Electric, the manufacturing arm; and Westrex, a division of Western Electric specializing in movie theater equipment, PA system, broadcast sound equipment, and movie sound equipment.
The AT&T organization had invented stereophonic sound, high fidelity sound, “talkies” (movies with synchronized soundtrack), the transistor, and much more. In the 1980s, a lawsuit by the United States federal government declared AT&T an illegal monopoly, breaking it up. Bell Labs became Lucent Technologies, Western Electric and Westrex disappeared, The Bell System became several “Regional Bell Operating Companies”, RBOCs, and AT&T became a long stance and cellular telephone provider.