Category:Keystone B-4

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Keystone B-4 
Keystone Y1B-4 (SN 30-281).jpg
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Keystone B-4 (it); Keystone B-4 (fr); Keystone B-4 (vi); Keystone B-4 (en); Keystone B-4 (es); Keystone B-4 (tg); Keystone B-4 (nl) avion militaire (fr) Keystone b-4a, Keystone B-4A (fr)
English: Keystone B-4