R-1820-31 (Q15138599)
9-cylinder radial engine model by Wright
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aliases Wright R-1820-31
 R1820-31
 Cyclone 31
 Wright R-1820-31 Cyclone 9
 Cyclone 9-31
 Wright Cyclone 9-31
 Curtiss-Wright R-1820-31
description 9-cylinder radial engine model by Wright