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Patents > Grant date: 1919 & CPCs: None & Number of text pages: 3-6

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airplane (6) · frame (6) · construction (6) · design (5) · Airship (5) · stability (3) · Instrument (3) · LTA (3) · None (2) · fuselage (2) · wings (2) · gas (2) · propulsion (2) · propellers (2)
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