technology, general, supersonic, high voltage - supersonic concentrator, institute for acoustics, academy of sciences, USSR, circa 1960, Additional-Rights-Clearance-Info-Not-Available

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Keywords: 1950s, 1960s, 20th, academies, academy, acoustics, century, concentrator, engineering, general, high, historic, historical, institute, institutes, people, republics, socialist, soviet, supersonic, technologies, technology, transsonic, ultrasonic, union, ussr, voltage-supersonic