
Strowger step-by-step automatic telephone exchange switch, 1897-1898
1897-1898
1897-1898
1889
1830 (original); 1967 (model)
1897
1888
1889
1893
1896
1839 (original); circa 1988 (replica)
1775-1799 (original); 1900-1907 (model)
1668; 1924
1890
1898
1898
About 1890
circa 1897
1990-96
1610; 1923
1772 (original); 1919 (model)
2000-100 BCE
1925; 1862
1887 - 1935
1890-1899
circa 1891
1895-1899
1990-95
1888 - 1971
1889 - 2006
1889
1890
1934
1895
1897
1890
1889
1890
1890
1898-1899
1934
1801-1840 (original); 1901 (model)
1705-1737
1897
1898 - 1931
1897 - 2012
1892 - 1974
1890-1894
1896
1894
1895
1892