. . . "Grigorovich M-20" . . . "Grigorovich G.5" . . . . . . . . . . . "M-10" . "M-7" . . . . "M-5" . "M-8" . . . . "Grigorovich M-5" . . . "M-6" . "M-20" . . "Shchetinin M-5" . . . "Grigorovich M-5" .