
Strowger step-by-step automatic telephone exchange switch, 1897-1898
1897-1898
1897-1898
1830 (original); 1967 (model)
1897
circa 1900
circa 1900
1839 (original); circa 1988 (replica)
1775-1799 (original); 1900-1907 (model)
1901
1668; 1924
1898
1898
circa 1897
1901
1990-96
1610; 1923
1772 (original); 1919 (model)
2000-100 BCE
1901
1925; 1862
1990-95
1934
1897
1898-1899
circa 1900
circa 1900
1934
1801-1840 (original); 1901 (model)
1705-1737
1897
circa 1900
1899
1580-1588; 1930
1899
1897
4000-2001 BCE
300 BCE; 1905-1915
1960-1979
2050-1750 BCE
1898
1899
1955; 1830
1898-1900
1901
1936
1897
1834-1836
1798 (original); 1977 (model)
1879 (1956)
1897
2000-1001 BCE