![](https://coimages.sciencemuseumgroup.org.uk/242/484/large_thumbnail_1984_0535__0001_.jpg)
Logic door from a Ferranti Mark I computer, 1951
1951
1951
2000-100 BCE
1951
1955; 1830
1951
1951
1951
1938 and 1951
1951
1951
1951
1986 (replica); 1501-1600 (original)
1950
1951
1951
4000-2001 BCE
1951
1951
1951
1903 (original); 1982 (model)
1830 (original); 1967 (model)
1990-96
1951-1900
1965-1950
1951
1971-1900
1952
1991-1783 BCE
1951
1951
1951
1951
1952
1952
1952
1952
between 1937 and 1953
1952
1951
1952
circa 1951
1952
1951
1951
1952
2000-1350
1970-1910
1951
c.1952
1952