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Patents > Year granted: 1919 & Office: FR & IPCs : IPC B64C3/00 or IPC B64C3/38 or IPC B64C39/00

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airplane (8) · None (6) · construction (4) · Design (4) · Wings (3) · nervure (2) · stays (2) · frame (2) · longerons (2) · airfoil (2) · attachment (2)
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