Aircraft Models
- Huff-Daland TA-6, TW-5, AT-1, AT-2 biplane observation/trainers (1923-1925)
- Huff-Daland XB-1 Twin-engine experimental military bomber biplane (1927)
- Keystone PK-1 flying boat, a licence-produced PN-12
- Keystone LB-5A/LB-6/LB-7 Twin-engine twin-tail series of light bomber biplanes, 60 produced 1927-1929
- Keystone B-3A/B-4A/B-5A/B-6A Twin-engine single-tail series of bomber biplanes, 127 produced 1930-1933
- Keystone K-47 Pathfinder Three-engine biplane (1927)
- Keystone K-55 Pronto (1928)
- Keystone-Loening K-84 Commuter Single-engine amphibious biplane (1929)
- Keystone-Loening K-85 Air Yacht Single-engine amphibious biplane (1929)
- Keystone NK Naval biplane trainer (1928)
- Keystone PK Twin-engine amphibious biplane (1930)
Read more about this topic: Keystone Aircraft
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—Samuel Butler (1835–1902)