
BBC L1 lip microphone, 1937-1960
1937-1960
1937-1960
1946-1948
1923
1923
1943
1959
1970-1978
1934-1945
1985
circa 1964
1974
1972
2002-2004
1926-1929
circa 1954
1970
circa 1931
1971
1927-1933
1927
1985
1930s
1981
1948-1955
1982
1976
1990