Image: Oemichen2
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Description: Étienne Oehmichen Helicopter No. 2, 1923-1924. On May 4 1924, it was the first helicopter to fly on the distance of one kilometer (0.6 mile) in a closed-circuit, landing at his starting point.
Title: Oemichen2
Credit: Public domain
Author: Unknown
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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