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Patents > IPCs : IPC A63H27/22 or IPC B64C3/18 & Number of figures: 2-7

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construction (19) · frame (18) · airplane (8) · design (8) · structure (7) · None (5) · metal (5) · wings (4) · spars (4) · aerodynamics (4) · ribs (4) · wing (3) · monoplane (3) · toy (3) · LTA (3)
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