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Patents > IPCs : IPC B64B1/62 or IPC B64C3/54 & Citations from after 1930: None & Number of text pages: 3-20000000

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LTA (15) · Airplane (11) · gas (9) · design (8) · wings (6) · control (6) · Construction (5) · stability (5) · navigation (5) · lift (5) · ballonet (5) · balloon (5) · Aerodynamics (4) · None (4)
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