Original World War 2 business industry trade magazine vintage ad for EITEL McCULLOUGH, INC. of San Bruno, CA.  Electronics is the Vacuum Tube. This new industrial era, the post war revolution, that's coming as a result of electronics is really the result of diversification of the uses for vacuum tubes, the same type of vacuum tubes which are used in radio communications.  Old 1943 WW2 era propaganda magazine advertisement.