
Variable power supply (from mobile phone repair workshop), 1990-2012
1990-2012
1990-2012
1989
1938
1938
1984
1974
1938
1952
1980s
1930-1960
1940-1960
1977
1938
1952
circa 1966
1973
1997
1996-2003
2016
circa 1950-1970
1982
1994
1955-1960
1930-1960
1900-1949