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https://www.deroaviation.ro/index.html DE-RO Aviation - Ultra light aircraft manufacturing and repairs ultra light aircraft de ro aviation manufacturing https://vj-17.com/ Volmer Jensen: Inventor of the 3 axis controlled Hang Glider and vj-23w ultra-light aircraft Learn about Volmer Jensen, the pioneer who invented the hang glider and the JV-17 Penguin preflight classroom trainer in 1943.