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Description
| Manufacturer: | Thomas-Morse | |
| Base model: | O-21 | |
| Designation: | XO-21 | |
| Designation System: | U.S. Air Force | |
| Designation Period: | 1924-1942 | |
| Basic role: | Observation | |
| Status: | Experimental | |
Specifications
| Not Yet Available |
Known serial numbers
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Description
Specifications
Known serial numbers | ||||||||||||||||||||||||||||
