Columbia subject headings:
Harvard subject headings:
Inventions--Germany--History.
Inventors--Germany--Biography.
Kundt, August, 1839-1894.
Lummer, O. (Otto), 1860-1925.
Physicists--Germany--Biography
Politechnika Wrocławska.
Schuster, Kurt, 1903-1995.
Sound--Research--Germany--History.
Princeton subject headings:
Inventions--Germany--History.
Inventors--Germany--Biography.
Kundt, August, 1839-1894.
Lummer, O. (Otto), 1860-1925.
Physicists--Germany--Biography.
Politechnika Wrocławska.
Schuster, Kurt, 1903-1995.
Sound--Research--Germany--History.