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Patents > IPCs : IPC B64C33/00 or IPC B64C35/00 & Number of diagram pages: 3-4

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airplane (11) · flapping (10) · frame (9) · design (6) · propulsion (6) · ornithopter (6) · hydroaeroplane (5) · construction (5) · hybrid (4) · fuselage (4) · navigation (3) · Hydroplane (3) · stability (3)
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