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Patents > Grant date: 1911 & National tech categories : AT 77d or DK 63

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airplane (12) · frame (10) · LTA (7) · Design (6) · Subsystem (6) · Drachenflieger (5) · whole (4) · Construction (4) · control (4) · stability (3) · Tragfläche (3) · propellers (3)
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