1981-06-02 /BB-4160F-BM/01/sort-documentation/srt4c.bwr 1981-06-02 /BB-H506D-SM_1983/01/sort/documentation/srt4c.bwr 1981-06-09 /BB-D489E-SB/01/srt4c.bwr 1981-06-09 /BB-H580C-SB_1981/01/srt4c.bwr