Heating mantle LG/ER/250 from Labmaster LG range
1994
1994
1600-1700
1891-1897
1880-1920
1880-1920
1960s
1880-1920
1927
circa 1960
1935
1905
1933
1891-1897
1938
1890
1890-1899
1930-1939
1920
1890
1951
1960-1965
1921
1928
1920
1920
1930
1925
1921-1930
1913-1925
1890-1900
1928
1930-1970
1905
1963
1920-1930
1964
1961
1929
1926
1963
1894-1910