1979-11-06 /BB-4172G-BM/01/4-documentation/ddt41.doc 1979-11-06 /BB-5255D-BM/01/4-documentation/ddt41.doc 1979-11-06 /BB-D868C-BM/01/4-documentation/ddt41.doc 1979-11-06 /BB-D868D-BM/01/4-documentation/ddt41.doc 1979-11-06 /BB-H138B-BM/01/4-documentation/ddt41.doc 1979-11-06 /BB-J713A-BM/01/4-documentation/ddt41.doc 1979-11-06 /bb-d868c-bm_tops20_v4_2020_distr/01/4-documentation/ddt41.doc