
BBC L1 lip microphone, 1937-1960
1937-1960
1937-1960
1967
1922-1924
1967
1923
1964-1988
1964-1988
1964-1988
2011
circa 1954
1970
circa 1931
1971
1985
1961
1985-1990
1970-1988
circa 1948
1979
circa 1963
circa 1931
circa 1962
1962
1960