Published in Autumn 2000 Zeiss Historica Journal
Author: Fridolin Berthel
See Page 6 – 9.
This biographical sketch of Dr. Küppenbender and his recollections of his time at Zeiss Ikon and the invention of the Contax cameras was prepared by Mr. Berthel who often worked with him with regard to publications inside of Zeiss Oberkochen. It is a personal overview but does not involve any of his personal history or that of other Zeiss personnel.
To go to the Journal itself, click on the year 2000 in the first line above.