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Patents > Inventor country: RU & Filing date: 1910 - 1919 & Number of text pages: 3

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airplane (5) · propulsion (4) · aerodynamics (4) · wings (3) · frame (3) · hydrodynamics (2) · whole (2) · hybrid (2) · helicopter (2) · steering (2) · marine (2) · energy (2)
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