IEEE spectrum
|
|
 |
 |
 |
|
December 1973 |
December 1976 | January 1978 | January 1980 |
|
|
|
 |
 |
|
November 1980 |
January 1981 |
February 1982 | December 1982 |
 |
 |
 |
 |
| January 1983 | March 1983 | December 1983 | January 1984 |
