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Patents > Office : CH or DK & Number of text pages: 4-5

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airplane (12) · design (10) · stability (10) · frame (10) · propulsion (9) · LTA (7) · propellers (6) · navigation (6) · Wings (5) · landing (4) · whole (4) · balloon (4) · aerodynamics (4) · subsystem (4) · control (4)
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