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Patents > National tech categories : DE 77h or DE 77h.5 & Number of text pages: 3-40

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airplane (16) · frame (12) · stability (10) · Tragfläche (8) · design (7) · navigation (5) · construction (5) · control (5) · wings (4) · airfoil (4) · propulsion (4) · propeller (4) · whole (3) · LTA (3) · lift (2) · hybrid (2) · None (2) · fuselage (2) · Flugzeug (2) · biplane (2)
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