Originally Huff-Daland; became Keystone March 1927, still centered at Bristol, Pennsylvania. Later absorbed Loening, becoming Keystone-Loening, and then became part of Curtiss-Wright. Keystone was main supplier of twin-engined bombers to U.S. Army from 1927 to 1932. LB- 5A (25 delivered in 1928) was first true Keystone bomber. Largest USAAC bomber order in a decade was for 63 LB- 10A (all converted to B-3A and B-5A on change of Army categories). Last production contracts for bombers placed 1931 (for 25 B-4A and 39 B-6A). Pathfinder was three-engined civil transport; NK a biplane trainer for a 1928 competition (19 built); PK a twin-engined flying-boat based on NAF design (18 delivered in 1931). Patrician was three-engined 20-passenger low-wing monoplane. Other types were characteristically Loening, including the OL-8 biplane amphibian; the Air Yacht civil amphibian; and the Commuter four-seat cabin amphibian.

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