1981-07-14 /BB-H580C-SB_1981/04/purfg.rel 1981-07-14 /BB-H580C-SB_1981/05/purfg.rel 1981-07-15 /BB-H580C-SB_1981/06/purfg.rel 1981-07-15 /BB-H580C-SB_1981/07/purfg.rel 1981-07-15 /BB-H580C-SB_1981/10/purfg.rel 1985-10-08 /BB-H580E-SB_1985/05/purfg.rel 1985-10-08 /BB-H580E-SB_1985/07/purfg.rel 1985-10-08 /cobol12c/05/purfg.rel 1985-10-08 /cobol12c/07/purfg.rel