
One of Fleming's first thermionic diode valves, 1889
1889
1889
1830 (original); 1967 (model)
1888
1889
1893
1839 (original); circa 1988 (replica)
1775-1799 (original); 1900-1907 (model)
1668; 1924
1890
About 1890
1990-96
1610; 1923
1772 (original); 1919 (model)
2000-100 BCE
1925; 1862
circa 1891
1990-95
1888 - 1971
1889 - 2006
1889
1890
1934
1895
1890
1889
1890
1890
1934
1801-1840 (original); 1901 (model)
1705-1737
1892 - 1974
1890-1894
1894
1895
1892
1889-1894
1580-1588; 1930
4000-2001 BCE
before 1889
1889
1888
300 BCE; 1905-1915
1890 - 1932
1888 - 1946
1960-1979
2050-1750 BCE
1889 - 1999
1889 - 1926
circa 1890
circa 1890