
Ring transformer, 1892
1892
1892
1901-1913
1993
2000-2002
1982
1997
1843-1889
1807
1842
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1893-1895
1895
1893
1893-1895
circa 1950s
1955-1960
2020
before 1889
1886
before 1889
1850-1900
1850-1900
1982
2016-2017
2015-2018
1978
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1880-1895
1893-1895
1893-1895
1893-1895
1939-1945
1893
1940-01-15
1850-1900
1909-1910
2016-2017
1850