1923 in science
The year 1923 in science and technology involved some significant events, listed below. == Aeronautics == January 17 (or 9) – First stable flight of the first rotorcraft, Juan de la Cierva's Cierva C.4 autogyro, in Spain.
The year 1923 in science and technology involved some significant events, listed below. == Aeronautics == January 17 (or 9) – First stable flight of the first rotorcraft, Juan de la Cierva's Cierva C.4 autogyro, in Spain.
The year 1923 in science and technology involved some significant events, listed below. == Aeronautics == January 17 (or 9) – First stable flight of the first rotorcraft, Juan de la Cierva's Cierva C.4 autogyro, in Spain.
Source: Wikipedia "1923 in science" · CC BY-SA 4.0
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