Drilldown: Patents

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Patents > National tech categories : DE 77 or FR 6.2 & Citations from after 1930: None & Number of text pages: 3

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propulsion (19) · LTA (15) · propellers (11) · navigation (8) · design (6) · balloon (5) · None (4) · marine (4) · Control (4) · car (4) · frame (4) · ascension (4) · airship (4) · stability (3) · steering (3) · subsystem (3) · Sustentation (3) · lift (3) · hybrid (3)
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