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Patents > National tech categories: FR 6.4 & IPCs : IPC B64C23/00 or IPC B64C3/54 & Number of figures: 4-7

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None (3) · Robert Esnault-Pelterie (2) · Maurice-Achille Lécuyer (2)
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None (4) · Robert Esnault-Pelterie (2) · Maurice-Achille Lécuyer (2)
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Tech fields:
Airplane (25) · None (15) · design (13) · Lift (9) · construction (7) · Wings (7) · propulsion (7) · hybrid (7) · Sustentation (6) · propellers (6) · frame (6) · helicopter (6) · Aerodynamics (4) · ascension (4) · heavier-than-air (4) · LTA (3)
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Showing below up to 51 results in range #1 to #51.

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