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Patents > Inventor country: DE & Number of text pages: 0-20 & Number of figures: 16-40

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propulsion (7) · frame (5) · None (4) · gas (4) · fabric (4) · design (4) · LTA (4) · propeller (4) · airplane (4) · safety (4) · propellers (3) · Stability (3) · ornithopter (3) · ballonet (3) · Flapping (3) · navigation (3) · Wings (3)
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