Drilldown: Patents

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Patents > Year filed: 1899 & National tech categories: None

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None (10) · LTA (9) · propulsion (6) · design (4) · instrument (4) · balloon (4) · propeller (4) · frame (3) · propellers (2) · aluminum (2) · stability (2) · dirigible (2) · Aerostat (2) · kite (2)
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