Germany, in the 40-x was a one of most technological advanced state in the world. Following big concerns had created it's industry: VW, Mercedes(created in 1926, Benz & Daimler), Siemens(in 1847), particularly Ford, chemical concerns, omg, what else Germany had there and none of this technologies were assimilated by Soviet Union?
"Why is the Moon made of Green cheese ?" This is the same type of question. Soviet Union did take everything it could from Germany. Including whole factories, machine tools, documentation, and specialists. (Most of the specialists were released and returned in 1950s). On a very large scale.
As a child I lived in Soviet Union and had some opportunities to visit several factories. This was in 1960-70th. Most of the machinery I've seen there was German made and dated 1930th. It was hopelessly obsolete at the time when I saw it, of course. Whole new industries started in Soviet Union based on the war booty. For example sometimes famous Soviet optics (photo cameras, binoculars etc.) Till the very end of Soviet Union this was produced with German machinery, by German technology. Not to mention the rocket science and space technology. Standard lab equipment (like oscillographs) just did not exist in Soviet Union before 1945, except possibly some purely working experimental samples.