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Patents > National tech categories: FR 6.4 & IPCs: None & Number of text pages: 3-11

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None (6)
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airplane (16) · stability (10) · None (9) · frame (9) · design (7) · whole (5) · propulsion (5) · navigation (5) · propeller (3) · piloting (3) · lift (3) · heavier-than-air (3) · wings (3) · Construction (3)
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