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XB-15, Boeing
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
Xiphos