Columbia subject headings:
Harvard subject headings:
Clock and watch industry--Germany--Pforzheim--History.
Wrist watches--Design and construction--History.
Wrist watches--Germany--Pforzheim--History.
Princeton subject headings:
Clock and watch industry--Germany--Pforzheim--History.
Wrist watches--Design and construction--History.
Wrist watches--Germany--Pforzheim--History.