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The Waco 10/GXE/Waco O series was a range of three-seat open-cockpit biplanes built by the Advance Aircraft Company, later the Waco Aircraft Company.
The Westland Westbury was a British twin-engined fighter prototype of 1926. Designed by Westland Aircraft it never entered service but played a useful role in the testing of the COW 37 mm gun. Only the two prototypes were completed.
