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Douglas XO-31
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Description
  Manufacturer: | Douglas |
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  Base model: | O-31 |
  Designation: | XO-31 |
  Designation System: | U.S. Air Force |
  Designation Period: | 1924-1942 |
  Basic role: | Observation |
  Status: | Experimental |
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Specifications
Known serial numbers
 
 
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