Keystone B-4
The Keystone B-4 was a biplane bomber, built by the Keystone Aircraft company for the United States Army Air Corps.
| B-4 | |
|---|---|
| Keystone Y1B-4 (S/N 30-281) | |
| Role | Light bomber |
| Manufacturer | Keystone Aircraft |
| Status | Retired |
| Primary user | United States Army Air Corps |
| Number built | 5 Y1B-4 25 B-4A |
| Developed from | Keystone B-3 |
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