1935, “State Optical Institute” (GOI) Leningrad, USSR
1948, “State Optical Institute” (GOI) Leningrad, USSR
1934, “Union of Optico Mechanical Factories” (VOOMP)
1948, “State Optical Institute” (GOI) Leningrad, USSR
1950, “State Optical Institute” (GOI) Leningrad, USSR
1935, “Union of Optico Mechanical Factories” (VOOMP)
1934, “Union of Optico Mechanical Factories” (VOOMP)
