Produced a number of single-engined military biplanes in the early 1920s, when James McDonnell (later of the McDonnell Douglas Company) was chief engineer. The XLB-1 three-seat, single-engine light bomber was tested in 1923 and was developed as the twin-engined XLB-3, with a crew of five. In 1924 Huff-Daland was reorganized as Keystone Aircraft Corporation and the production bomber aircraft was known by this latter company name.

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