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Description
| Manufacturer: | Sikorsky | |
| Base model: | R-4 | |
| Designation: | YR-4 | |
| Version: | A | |
| Designation System: | U.S. Air Force | |
| Designation Period: | 1941-1947 | |
| Basic role: | Rotary Wing (Helicopter) | |
| Status: | Prototype | |
| See Also: | ||
Specifications
| Not Yet Available |
Known serial numbers
