Keystone B-4

B-4
Keystone Y1B-4 (S/N 30-281)
General information
TypeLight bomber
ManufacturerKeystone Aircraft
StatusRetired
Primary userUnited States Army Air Corps
Number built5 Y1B-4
25 B-4A
History
Developed fromKeystone B-3

The Keystone B-4 was a biplane bomber, built by the Keystone Aircraft company for the United States Army Air Corps.

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