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XA-4, Curtiss
XA-13, Northrop
XA-14 Shrike, Curtiss
XA-16, Northrop
XA-43, Curtiss
XB-15, Boeing
XHB-1 Cyclops, Huff-Daland
XHB-2, Atlantic
XHB-3, Huff-Daland
Xiphos
XLB-3, Huff-Daland
XLB-3A, Keystone
XLB-5, Huff-Daland
XLB-12, Keystone
XP-37, Curtiss
XP-41, Seversky
XP-44 Rocket, Republic
XP-46, Curtiss
XP-52, Bell (Model 16)
XP-53, Curtiss
XP-59, Bell (Model 16)
XP-60, Curtiss
XP-72, Republic
XP-77, Bell
XP2M, Martin
XPY Admiral, Consolidated