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Patents > IPCs : IPC B64B1/00 or IPC B64C17/00 & Number of figures: 16-30

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Stability (17) · LTA (10) · None (7) · Automatic stability (7) · Airplane (7) · control (5) · propulsion (4) · frame (4) · navigation (4) · propeller (3) · landing (3) · hybrid (3) · balloon (3)
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