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Patents > Filing date: 1910 & National tech categories : FR 6.3 or HU V/h & First filing: No

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subsystem (15) · Airplane (12) · Design (9) · Construction (8) · Propellers (8) · Frame (7) · whole (7) · Control (5) · Stability (4) · Automatic stability (4) · Airship (4) · Chassis (3)
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