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Patents > National tech categories : FR 6.3 or USPC 244/233 & Number of diagram pages: 3-4

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propulsion (11) · LTA (9) · navigation (9) · airplane (9) · None (7) · aerostat (6) · construction (6) · texture (4) · frame (4) · dirigible (3) · landing (3) · hybrid (3) · parachute (3) · propeller (3) · propellers (3) · ascension (3) · safety (3)
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