Logic door from a Ferranti Mark I computer, 1951
1951
1951
1951
1951
1951
1955; 1830
2000-100 BCE
1938 and 1951
1951
1951
1951
1986 (replica); 1501-1600 (original)
1951
1903 (original); 1982 (model)
1951
1990-96
1951
1830 (original); 1967 (model)
1950
4000-2001 BCE
1951
1951
1951
1951-1900
1971-1900
1951
1951
1952
1952
circa 1951
1952
1951
1951
1952
2000-1350
1970-1910
c.1952
1952
1951
1972-3
1952
1951
1951
1952
1951
1952
1952
1952
1952
1951
1952