Columbia subject headings:
Harvard subject headings:
Electric industries--Germany--History--20th century.
Electronic industries--Germany--History--20th century.
Trade associations--Germany--History--20th century.
Zentralverband Elektrotechnik- und Elektronikindustrie--History--20th century.
Princeton subject headings:
Electric industries--Germany--History--20th century.
Electronic industries--Germany--History--20th century.
Trade associations--Germany--History--20th century.
Zentralverband Elektrotechnik- und Elektronikindustrie--History--20th century.