Hewitt-Sperry Automatic Airplane — Wikipédia
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Unmanned aerial vehicle, Military Wiki
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History of unmanned aerial vehicles - Wikipedia
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Norden bombsight, Military Wiki
How many planes have never been found? - Quora
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The use of military 'drone' aircraft goes back to World War I
![](https://naval-encyclopedia.com/naval-aviation/ww1/usa/Curtiss_18T-1.jpg)
WW1 USN Aviation - naval encyclopedia
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The Hewitt-Sperry Automatic Airplane: The First Cruise Missile
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Unmanned aerial vehicle, Military Wiki
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Introduction SpringerLink
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Hewitt-Sperry Automatic Airplane Wikipedia audio article
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Curtiss-Sperry Aerial Torpedo at the Cradle of Aviation Museum
Did the US have cruise missiles during WW2? - Quora
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Switchblade Drones and You: Unmanned Warfare in 2023