Employees of the Central Radio Laboratory (Vacuum Physics and Technology Laboratory) CRL in Leningrad, Russia, 1930. In the second row, left to right: D. E. Painters, N. V. Nefedieva, B. A. Ostroumov, V. N. Lepeshinskaia, S. I. Bogomolov, E. G. Koenig. In the fourth row, third from the left Oleg V. Losev.