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