Columbia subject headings:
Harvard subject headings:
Industrial revolution--Germany--Saxony--Congresses.
Machine-tool industry--Germany--Saxony--History--19th century--Congresses.
Princeton subject headings:
Industrial revolution--Germany--Saxony--Congresses.
Machine-tool industry--Germany--Saxony--History--19th century--Congresses.
Machine-tool industry--Germany--Saxony--History--20th century--Congresses.