Boeing Y1B-9 from the left

Here we see the Boeing Y1B-9, an early monoplane bomber of 1930-31 that only reached pre-production status. However some of the lessons learnt on the B-9 helped with the development of the B-17 Flying Fortress.
How to cite this article: Rickard, J (7 April 2019), Boeing Y1B-9 from the left ,

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