Mechanical Calculation of Flexible Wires of Overhead Lines with Barrage Balls by I. I. Sergey, Y. V. Bladyko

“…Aerial barrage balls serve for marking high-voltage wires in order to visually warn pilots of civil and military aviation about the presence of overhead lines. …”
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Challenges for Air Transport Providers in Czech Republic and Poland by Anna Toruń, Czesław Burniak, Jerzy Biały, Justyna Tomaszewska, Norbert Grzesik, Sarka Hoskova-Mayerova, Marta Woch, Mariusz Zieja, Adam Rurak

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Moral factor in combat readiness of personnel and commanders of Air force of Red Banner Baltic fleet on the eve of Soviet-Finnish war of 1938–1939 by V. O. Levashko, A. L. Nikiforov

“…The study revealed the problems that led to a decrease in the level of combat readiness of the Red Banner Baltic fleet air force, and as a result, the failure of naval pilots to perform combat tasks during the Soviet-Finnish war…”
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Measuring. Monitoring. Management. Control by S.V. Logunov, E.V. Blagodyrenko, I.S. Gerasimenko, N.A. Kupriyanov