Columbia subject headings:
Harvard subject headings:
Askania-Werke AG--History.
Clock and watch industry--Germany--History.
Geräte- und Regler-werke Teltow--History.
Optical industry--Germany--History.
Scientific apparatus and instruments industry--Germany--History.
Princeton subject headings:
Askania-Werke AG--History.
Clock and watch industry--Germany--History.
GRW Teltow GmbH--History.
Optical industry--Germany--History.
Scientific apparatus and instruments industry--Germany--History.