Friedrich Rathgen died in 1942.
Friedrich Rathgen was born in 1862.
Friedrich Rathgen has written: 'Verwitterung und Erhaltung von Werksteinen' -- subject(s): Building stones, Testing
Karl Rathgen died in 1921.
Karl Rathgen was born in 1856.
F. Rathgen has written: 'The preservation of antiquities'
Rathgen Research Laboratory was created on 1888-04-01.
Friedrich Pfotenhauer died in 1939.
Friedrich Westmeyer died in 1917.
Friedrich Siebenrock died in 1925.
Friedrich Kiel died in 1885.
Friedrich Kipp died in 1869.
Friedrich Ladegast died in 1905.