Lenel Systems International was created in 1991.
R Systems International was created in 1993.
International Railway Systems was created in 2001.
Open Systems International was created in 1992.
International Decision Systems was created in 1980.
International Council on Systems Engineering was created in 1990.
International Society for the Systems Sciences was created in 1954.
International Foundation for Electoral Systems was created in 1987.
International Journal of General Systems was created in 1974.
International Federation for Systems Research was created in 1981.
Otto Lenel died in 1935.
Otto Lenel was born in 1849.
Ludwig Lenel was born in 1914.