Czechoslovakia Československo CALENDAR: Gregorian; LANGUAGES: Czech cz; Slovak sk (1939-1992); Ukrainian uk (1939); SCRIPTS: Czech, Slovak, Ukrainian‒ original; TRANSLITERATION: n/a; OTHER LANGUAGES: English equivalents Sources Czechoslovakia 1918-1939 Czechoslovak Republic Polity Style: 1918-1939 President of the National Council: 1918 Heads of State: 1918-1939 Czechoslovakia 1945-1990 Czechoslovak Republic, Czechoslovak Socialist Republic Polity Style: 1945-1990 Heads of State: 1945-1990 Czechoslovakia 1990-1992 Czechoslovak Federative Republic Polity Style: 1990-1992 Heads of State: 1990-1992