Variable power supply (from mobile phone repair workshop), 1990-2012
1990-2012
1990-2012
1938
1952
1980s
1989
1974
1938
1984
1940-1960
1930-1960
1938
1977
1938
1997
1952
circa 1966
1973
1996-2003
1982
2016
1994
1930-1960
1955-1960
circa 1950-1970
1986
1990-2010