Early helicopter design from 1928 known as the Pitts Sky Car https://t.co/3dfE6Yp7iq https://video.twimg.com/ext_tw_video/1779294359227113472/pu/vid/avc1/766x720/TSyOdqgOcZMpyGxd.mp4?tag=12
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Early helicopter design from 1928 known as the Pitts Sky Car https://t.co/3dfE6Yp7iq https://video.twimg.com/ext_tw_video/1779294359227113472/pu/vid/avc1/766x720/TSyOdqgOcZMpyGxd.mp4?tag=12
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