Columbia subject headings:
Harvard subject headings:
Family-owned business enterprises--Germany--History.
Machine-tool industry--Germany--History.
Steel industry and trade--Germany--History
Trumpf GmbH + Co.--History.
Princeton subject headings:
Family-owned business enterprises--Germany--History.
Machine-tool industry--Germany--History.
Steel industry and trade--Germany--History.
Trumpf GmbH + Co.--History.