Columbia subject headings:
Harvard subject headings:
Family-owned business enterprises--Germany--Göttingen--History.
Göttingen (Germany)--Economic conditions.
Mahr Group (Germany, Göttingen)--History.
Mahr, Carl.
Measuring instruments industry--Germany--Göttingen--History.
Princeton subject headings:
Family-owned business enterprises--Germany--Göttingen--History.
Göttingen (Germany)--Economic conditions.
Mahr Group (Germany, Göttingen)--History.
Mahr, Carl.
Measuring instruments industry--Germany--Göttingen--History.