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Patents > Year filed: 1912 & Office : AT or AU

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Tech fields:
Airplane (13) · propulsion (9) · Aerodynamics (7) · frame (7) · construction (5) · propellers (5) · Wings (5) · marine (4) · whole (4) · design (4) · Wheels (4) · stability (4) · helicopter (4) · hangars (3) · projectile (3) · military (3) · LTA (3) · chassis (3) · Flapping (3)
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