Drilldown: Patents

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Patents > National tech categories : DE 77 or USPC 244/100R & Number of figures: 8-17

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LTA (14) · propulsion (8) · navigation (8) · frame (6) · airship (6) · None (5) · propeller (4) · car (4) · stability (4) · balloon (4) · control (3) · airplane (3) · wheels (3) · landing (3) · helicopter (3)
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