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Lear Avia, Inc., ["Directional radio system (Case 17-2)" -- patent application [RM files], 1940], [2000-06-20_container_126]. Museum of Flight Digital Collections, accessed 12/12/2025, https://digitalcollections.museumofflight.org/nodes/view/5431




![["Directional radio system (Case 17-2)" -- patent application [RM files], 1940] ["Directional radio system (Case 17-2)" -- patent application [RM files], 1940]](/img/placeholder.gif?1761251355)