Marconi Instruments Limited
1900 - 1998
1900 - 1998
1891 - 1901
1908 - 1964
1907 - 2002
1892 - 1951
1890 - 1922
1897 - 1907
1893 - 1922
1898 - 1968
1896 - 1917
1891 - 1909
1906 - 1922
1899 - 1902
1905 - 1980
1892 - 1989
1895 - 1947
1894 - 1928
1902 - 1930
1898 - 1943
1898 - 1909
1891 - 1928
1902 - 1927
1904 - 1912
1898 - 1922
1898 - 1994
1908 - 1994
1895 - 1970
1900 - 1972
1905 - 1993
1907 - 1998
1895 - 1949
1906 - 1970
1896 - 1962
1905 - 1989
1907 - 1996
1902 - 1960
1894 - 1960
1890 - 1965
1903 - 1922
1901 - 1968
1896 - 1985
1899 - 1971
1900 - 1990
1902 - 1964
1904 - 1958
1896 - 1965
1897 - 1956
1907 - 2002
1906 - 1977
1907 - 1976