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System X circuit board from digital switching subsystem, 1980
1980
1980
1974
circa 1972
1965-1971
1965-1971
1989
1960
1960
1953
1979
1968
circa 1956
1978
circa 1972
circa 1956
2013
1976
1950
2006-2010
2006-2010
1980
1957
1963-1969
1985-1992
circa 1972
circa 1972
1965-1971
circa 1972
circa 1972
circa 1975
1985-1992
1973-1975
2006-2010