Drilldown: Patents

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Patents > Office : DE or UN & Inventor country : AT or BE or Brazil

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Tech fields:
propulsion (10) · LTA (10) · balloon (7) · None (4) · airplane (4) · engine (4) · control (3) · propeller (3) · aerodynamics (3) · frame (3) · marine (3)
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Citations from after 1930:
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