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Hoppi-Copter 102 (c1948)
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- Опубликовано: 26 янв 2021
- developed by Hoppi-Copters Inc. founded by Horace T. Pentecost in the 1940s
en.wikipedia.o...
credit the Royal Aeronautical Society
video National Aerospace Library
Shame these machine disappeared into obscurity very little mentioned about them