
One of Fleming's first thermionic diode valves, 1889
1889
1889
1830 (original); 1967 (model)
1886
1888
1872 (original); 1909 (model)
1889
1889
1955; 1830
before 1889
before 1889
1893-4
1934
2000-100 BCE
1886
1888
1889
1889
1705-1737
1934
1930 (replica); 1834 (original)
before 1889
1888
4000-2001 BCE
1839 (original); circa 1988 (replica)
1889
1668; 1924
1990-95
1610; 1923
1925; 1862
1936
1900-1933 (model); 1869 (original)
1834-1836
1889
1886
1889
1889
before 1889
1888
circa 3000 BCE
2000 BCE
1888
100 BCE-300 CE; 1890-1920
1887
1889
2000-1350
4000-30 BCE
10000-5000 BCE
10000-500 BCE
1972-3
2000-1000