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Patents > National tech categories : DE 77 or GB 4 without buoyant & Number of figures: 9-40

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LTA (13) · navigation (9) · None (7) · airship (6) · propulsion (5) · propeller (5) · frame (4) · stability (4) · car (4) · control (4) · balloon (3) · ornithopter (3) · flapping (3) · structure (2) · steering (2) · rudder (2) · wings (2) · dirigible (2)
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Showing below up to 33 results in range #1 to #33.

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