Columbia subject headings:
Electric industries--History.
Electronic industries--History.
Information technology--History.
Long waves (Economics)--History.
Technological innovations--Economic aspects--History.
Harvard subject headings:
Electric industries--History.
Electronic industries--History.
Information technology--History
Long waves (Economics)--History.
Technological innovations--Economic aspects--History
Princeton subject headings:
Electric industries--History.
Electronic industries--History.
Information technology--History.
Long waves (Economics)--History.
Technological innovations--Economic aspects--History.