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Patents > National tech categories : CH 129b or USPC 244/105 & Number of claims: 5-50

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airplane (11) · frame (8) · design (8) · stability (6) · wings (5) · whole (5) · Flapping (4) · propeller (3) · marine (3) · lift (3) · landing (3) · heavier-than-air (3) · Hydroaeroplane (3) · control (3)
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