Pair of Helmholtz Coils to fit Teltron Fine Beam Tube, 1997
1997
1997
1540-1580
1942
1942
1888
1946-08
1946-08-19
1950
1997
1942
1560-1660
1942; 1501-1600
1940-1942
1970-1973
1920-1930
1956-08
1920
1920-1930
1997
1942
1942
1910
1933
1942
1958