
BBC L1 lip microphone, 1937-1960
1937-1960
1937-1960
1946-1948
1923
1923
1923
circa 1985
circa 1963
1953-1955
1970-1978
1996
1998
1998
1963-1993
1966-1968
circa 1964
1974
1972
1982
1998
circa 1967-1968
1926-1929
circa 1954
1970
circa 1931
1971
1927-1933
1927
1985
1930s
1981