Helmut Ruska died in 1973.
Helmut Ruska was born in 1908.
Julius Ruska died in 1949.
Ernst Ruska died on May 25, 1988 at the age of 81.
Helmut Beinert died in 2007.
Helmut Krackowizer died in 2001.
Helmut Hönl died in 1981.
Helmut Heißenbüttel died in 1996.
Helmut Pfeiffer died in 1945.
Helmut Damerius died in 1985.
Helmut Schäfer died in 1994.
Helmut Friedlaender died in 2008.
Helmut Sturm died in 2008.