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Patents > Inventor country: DE & Citations from after 1930: None & Number of figures: 12-13

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LTA (8) · airplane (6) · None (4) · propulsion (4) · navigation (4) · balloon (3) · helicopter (2) · wings (2) · stability (2) · propellers (2) · propeller (2) · metal (2) · lift (2) · Zeppelin (2) · aerodynamics (2) · frame (2) · airship (2)
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