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Patents > Office : ?? or DE or LU or US & Inventor country: AT

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Tech fields:
propulsion (11) · airplane (10) · Wings (8) · LTA (8) · propellers (5) · propeller (5) · frame (5) · design (4) · Flapping (4) · engine (4) · None (4) · balloon (4) · aerodynamics (4) · stability (3) · marine (3) · construction (3) · control (3)
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Citations from after 1930:
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