
BBC L1 lip microphone, 1937-1960
1937-1960
1937-1960
1878-1890
1878-1890
1878-1890
1878-1890
1878-1890
1878-1890
1878-1890
1878-1890
1920-1940
1878-1890
1878-1890
1923
1925-1935
1865-1875
1929-1935
circa 1934
circa 1963
1961
circa 1965
1961
1950-60
circa 1978
circa 1978
circa 1968
1971
circa 1961
1971
circa 1955
1957
1955