Atomic clock prototype for 'Galileo' satellite, 2002
2002
2002
1960s
1987
1938
1879
1640
1973
1965
circa 1990s
1969
1619
1961-1970
1949
1930
Unknown
1839
1958
2015
1908-1925
1974-1980
1865
1972
1969-1970
1960-1975
1955-1970
1905-1925
1965-1975
1950-1970
2016
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1850-1900
1971-1979
1937
1948-02-01
1870-1920