Columbia subject headings:
Harvard subject headings:
Conglomerate corporations--United States--History.
Electric industries--Germany--History.
Electric industries--United States--History.
Electrical engineering--History
Industrialization--United States--History.
International busines enterprises--Germany.
International busines enterprises--United States
Siemens Aktiengesellschaft--History.
Princeton subject headings:
Conglomerate corporations--United States--History.
Electric industries--Germany--History.
Electric industries--United States--History.
Industrialization--United States--History.
Siemens Aktiengesellschaft--History.