08/1977-04/1979
04/1979-04/1982
04/1979-08/1980
04/1979-02/1983
03/1978-04/1979
12/1979-04/1982
- )BU23..BTP ; (7708- )BU23..20T,275 ; (7708- )BU25,3#,4#,5# ; (7708- )BU20,21,22..T3