In the photo, Igor Merkulov prepares the first Soviet two-stage rocket for launch. In 1936, Igor Merkulov (Group for the Study of Reactive Motion) designed the world's first two-stage rocket, which had powder and propulsion jet engines. The official tests of this rocket took place in May 1939, at the Planerskaya railway station near Moscow.
P.S.RV-3 rocket. I scanned the photo about 10 years ago in an old magazine. In an artcle about Igor Merkulov. Little-known designer because his biography is connected with secret hypersonic speed missiles and a scramjets. The second photo from the article rgantd.ru The article is dedicated to the 80th anniversary of the test of the two-stage rocket "RV-3" designed by Igor Alekseevich Merkulov