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Patents > National tech categories: FR 6.4 & IPCs: IPC B64C11/00 & Number of figures: 4-7

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propulsion (16) · Propellers (10) · airplane (8) · LTA (5) · None (5) · design (5) · subsystem (4) · marine (3) · helicopter (2) · navigation (2) · Aerodynamics (2) · aerial propeller (2) · HTA (2) · Aerostat (2) · Dirigibles (2) · propeller (2) · Sustentation (2) · texture (2) · ascension (2) · Airship (2)
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