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![[Mechanic working on Boeing Model 40B-4 aircraft]](/img/placeholder.gif?1761170956 "[Mechanic working on Boeing Model 40B-4 aircraft]")
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[Mechanic working on Boeing Model 40B-4 aircraft], [2008-03-31_image_663]. Museum of Flight Digital Collections, accessed 07/11/2025, https://digitalcollections.museumofflight.org/nodes/view/10841