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Patents > Inventor country: RU & National tech categories: FR 6.4 & Number of text pages: 1-2

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airplane (9) · aerodynamics (4) · propulsion (4) · wings (3) · frame (3) · ascension (3) · stability (3) · LTA (3) · takeoff (2) · sustentation (2) · subsystem (2) · Lift (2) · launching (2) · None (2) · aeroplane (2) · Automatic stability (2)
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