1986-04-23 /BB-F492Z-DD_1986/04/1,4/tgha.dat 1988-12-12 /k20v7c/01/system/tgha.dat 1989-05-02 /BB-FI81B-DD_1989/04/1,4/tgha.dat 1990-06-19 /SRI_NIC_PERM_FS_1_19910112/01/system/tgha.dat