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Northrop XP-56
Beech XA-38 Grizzly
Consolidated-Vultee XA-41
Douglas XA-42 Mixmaster
Curtiss XA-43/XP-87 Blackhawk
Boeing XB-15
North American XB-28
Douglas XB-42 Mixmaster
Curtiss XP-46
   Grumman XP-50
Vultee XP-54
Curtiss-Wright XP-55 Ascender
Northrop XP-56
Lockheed XP-58 Chain Lightning
Curtiss-Wright XP-60
Curtiss XP-62
McDonnell XP-67
Republic XP-72
   Fisher XP-75 Eagle
Bell XP-77 Lightweight Fighter
Northrop XP-79B
Consolidated-Vultee XP-81
Bell XP-83 Jet Fighter
Curtiss XP-87 Blackhawk
Ryan FR-1 Fireball
Ryan YO-51 Dragonfly
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