08/1977-02/1983
08/1977-08/1984
08/1977-04/1981
12/1979-08/1984
08/1980-04/1981
12/1979-04/1981
04/1979-08/1984
04/1981-08/1984
04/1981-02/1983
08/1977-04/1982
(7910- )BU20,RU20..TS..WT..GEN ; (8207-8408)R