Columbia subject headings:
Electric wire and cable industry--Great Britain--History--19th century.
Siemens Brothers & Co.--History.
Harvard subject headings:
Electric wire and cable industry--Great Britain--History--19th century.
Siemens Brothers & Co.--History.
Princeton subject headings:
Germany--Commerce--History.
Investments, German--England--History.
Siemens Aktiengesellschaft--History.