ИСТИНА

Despite of the opinion that EPR discovery was impossible without radar technology, the first setup of E.K. Zavoisky worked in the radio frequency range and used the principles and de-tails of classical radio technique. Nevertheless, the frequencies shifted towards decimeter waves and magnetrons and klystrons soon appeared as the microwave sources in the later works of Kazan scientific school, which contributed substantially to the development of EPR technique during the next years. Another forceful stream in the development of EPR spec-troscopy techniques began later (near 1953) in Moscow, in the laboratory of oscillations of the P.N. Lebedev Physical Institute — although not completely independently, but with the arrival of A.A. Manenkov, a PhD student of S.A. Altshuler. The third and seemingly inde-pendent branch of the development of the EPR technique was associated with the N.N. Semenov’s Institute of Chemical Physics (and namely with L.A. Blumenfeld, V.V. Vo-evodsky, and A.G. Semenov) and led to the first Soviet industrial EPR-spectrometer RE-1301 in 1961, i.e. decade and a half after Zavoisky’s discovery.