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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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None (10) · propulsion (10) · Airplane (9) · LTA (9) · navigation (8) · aerostat (6) · construction (5) · frame (4) · texture (4) · dirigible (3) · propellers (3) · propeller (3)
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