Astatic Current Indicator (No 615) marked 'Crompton's patent' maded by R E Crompton & Co
circa 1878-1927
circa 1878-1927
1880-1920
1830-1900
1799-1870
1831-1940
1851-1894
1896-1925
1950-1955
1940-1960
Unknown date
2015
1965-1975
1880-1885
1914-1934
1888-1901
1895-1900
1930-40
1959
2020-2023
2020-2023
1900-1935
1803-1876
1828-1860
1860-1920
1850-1900
1831-1870
1950-1980
1950-1955
1960-1969
1970
1901-1930
1959
1937
1968
1898-1935
1930-1931
1921
2020-2023
2016
1901-1930