Columbia subject headings:
Harvard subject headings:
Automobile industry and trade--Technological innovations--Germany--History--20th century.
Automobile industry and trade--Technological innovations--Germany--History--21st century.
Gear industry--Germany--History--20th century.
Gear industry--Germany--History--21st century.
Zahnradfabrik Friedrichshafen AG--History.
Princeton subject headings:
Automobile industry and trade--Technological innovations--Germany--History--20th century.
Automobile industry and trade--Technological innovations--Germany--History--21st century.
Gear industry--Germany--History--20th century.
Gear industry--Germany--History--21st century.
Zahnradfabrik Friedrichshafen AG--History.