
BBC ME12/7 Portable Test Programme Meter
1971
1971
1930-1950
1938
1938
1960
1971
1944
1965-1975
1965-1975
1954
circa 1989
circa 1989
circa 1989
circa 1977
1960
circa 1930
1973
1977
1938
1930-1935
circa 1989
circa 1989
circa 1989
circa 1989
circa 1989
1960-1979
circa 1945
1935
1965-1970
1965-1970
2012-2017
1935
1935
1935
1935
1935