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Patents > National tech categories : USPC 244/30 or USPC 244/65 & Number of diagram pages: 2-3

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LTA (15) · propulsion (10) · frame (7) · parachute (7) · safety (7) · car (6) · balloon (5) · marine (4) · airfoil (4) · propeller (4) · rudder (4) · helicopter (3) · propellers (3) · navigation (3) · ascension (3) · hybrid (2)
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