[1st results of the use of the Soviet RPU-3-3 and RBU-3-4 automatic exposure relays].
D011859:Radiography / Q000295:instrumentation*; D014586:USSR
Pervye rezul'taty ékspluatatsii otechestvennykh avtomaticheskikh rele ékspozitsii RPU-3-3 i RBU-3-4