In what year was Soviet engineer Valerian Abakovsky born: 1884, 1895, 1901 or 1910?

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Valerian Ivanovich Abakovsky was a Soviet engineer and inventor, best remembered for creating the Aerowagon, an experimental high-speed railcar.

Learn more on Codexery: Valerian Abakovsky in Inventors Killed by Their Own Invention

What does the amateur radio term 'CQ' mean when transmitted?

What does the Q-code 'QTH' mean in amateur radio communication?

What does the abbreviation 'FPV' stand for in the context of drone piloting?

What does ESC stand for in the context of electric RC vehicles?

What term describes the flight mode where a drone autonomously follows a moving subject using GPS or visual tracking?

What refresh rate, measured in hertz, became the standard baseline for competitive gaming monitors, doubling the traditional 60Hz?