skos:altLabel | - R-2
- R-1
- R-4
- Airco DH.9
- DH.9As
- Airco aircraft
- MR-1
- Polikarpov R-1
- D.H.9A
- D.H.9As
- DH.9A
- DH.9a
- DH9A
- DH9As
- DH9a
- De Havilland D.H.9A
- De Havilland DH.9A
- De Havilland DH.9C
- MR-2 (PM-2)
- Polikarpov DH.9A
- Polikarpov R-1 BMW
- Polikarpov R-1s
- de Havilland DH-9A
- de Havilland DH.9A
- de Havilland DH.9As
- de Havilland DH9A
- de Havilland R-1
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