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Patents > National tech categories : CA 244/23 or FR 6.3 & Number of text pages: 3-4

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navigation (9) · propulsion (9) · stability (6) · airplane (6) · construction (5) · steering (5) · safety (4) · propeller (4) · dirigible (4) · control (4) · LTA (4) · landing (4) · airship (4) · ascension (3) · wings (3)
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