1981-04-15 /BB-J939B-BM/01/binary/xpot20.rel 1984-02-02 /BB-J939D-BM/01/binary/xpot20.rel 1984-11-07 /BB-J939E-BM/01/binary/xpot20.rel 1989-08-08 /bb-j939f-bm/01/bliss/xpot20.rel