Columbia subject headings:
Information technology--History.
Microelectronics--History.
Technological innovations--Economic aspects--History.
Telecommunication--History.
Harvard subject headings:
Information technology--History
Microelectronics--History.
Technological innovations--Economic aspects--History
Telecommunication--History
Princeton subject headings:
Information technology--History.
Microelectronics--History.
Technological innovations--Economic aspects--History.
Telecommunication--History.