1984-11-27 /SRI_NIC_PERM_SRC_1_19910112/01/6-sources/t20ex6.rel 1985-04-11 /BB-H311D-RM/01/exec-sources/t20ex6.rel 1985-07-10 /tops20_v6_1_tcpip_distribution_tp_ft6/01/6-1-sources/t20ex6.rel 1985-08-23 /BB-H138E-BM/01/6-1-sources/t20ex6.rel 1985-08-23 /bb-h138e-bm_tops20_v6_1_distr/01/6-1-sources/t20ex6.rel