
Strowger step-by-step automatic telephone exchange switch, 1897-1898
1897-1898
1897-1898
1839 (original); circa 1988 (replica)
1934
2000-100 BCE
1955; 1830
circa 1897
1898
1898
1898
1898
1897
1897
1872 (original); 1909 (model)
1897
1801-1892 (prepared); 1946 (element replaced)
4000-2001 BCE
1897
1897
1897
1897
1934
1930 (replica); 1834 (original)
1897
1898
1898
1898
1897
1897
1705-1737
1830 (original); 1967 (model)
1925; 1862
1990-95
1668; 1924
1730-1760 (original); 1931-1939 (replica)
1866 (original) 1871 (model); 1906 (rigging modified)
1897
1936
1834-1836
1897
1898-06-21
1897
1897
1897
1901-1936; 180 BCE
1798 (original); 1977 (model)
1898
1801-1892 (prepared); 1926 (element replaced)
1801-1892 (prepared); 1926 (element replaced)
3000-1500
circa 1897