CODD By cartomarga Period: Nov 29, 1969 to Nov 30, 1969 Summit Primera red de información Period: Jan 1, 1970 to Jan 30, 1970 Codd Modelo Relacional Period: Nov 29, 1975 to Nov 30, 1975 Bill Gates Funda Microsoft Period: Nov 29, 1977 to Nov 30, 1977 Ellison Funda ORACLE Period: Nov 29, 1996 to Nov 30, 1996 Michael Widenius MySQL