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![[Man working on propellor of Christofferson 1914 Tractor aircraft]](/img/placeholder.gif?1761170956 "[Man working on propellor of Christofferson 1914 Tractor aircraft]")
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Forbes (photographer), [Man working on propellor of Christofferson 1914 Tractor aircraft], [2023-08-30_image_229]. Museum of Flight Digital Collections, accessed 10/11/2025, https://digitalcollections.museumofflight.org/nodes/view/25533