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- History of unmanned aerial vehicles Wikipedia
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- World War 1 History: The Kettering the World's First Drone - Owlcation
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- A Brief History of Imperial War Museums
- Chinese unveils world's first passenger drone at CES |
- History of Drones Milestones You Have to Know | Tips For Drones
- First: Drone Delivers That Saves Man Cardiac Arrest - leaps.org
- Chinese company to test single-passenger drone in US People's Daily Online
- Child given world's first drone-delivered vaccine - UNICEF