ANT-7/R-6/KR-6/MR-6: Development of TB-1 as reconnaissance (R-6), "cruiser" (escort fighter, KR-6), and maritime patrol/torpedo bomber (MR-6), 1931.
ANT-7/R-6/KR-6/MR-6 – Udvikling af TB-1 som opklarings- / spionfly (R-6), "cruiser" (escort jagerfly, KR-6), og flåde patrulje/torpedo bombefly (MR-6).