
System X circuit board from digital switching subsystem, 1980
1980
1980
1839 (original); circa 1988 (replica)
1981-1983
1984; 1983
1983
circa 1983
1983
1986
1980
1982
1982
1982
1982
1981-1982
1981
1981
1981
(1962); 1982
1983
1981
1980
2000-100 BCE
1980
1980-1981
1990-96
1982
circa 1980
1982
1981
1981
1903 (original); 1982 (model)
1982-1983
1982
4000-2001 BCE
1983
circa 1980
1980
1990-95
1983
1981
1983
1982
circa 1981
1983
1983
1959 (designed); 2001(made)
1981
1980-1982
1980
1980