skos:altLabel | - Ritchey
- ''Ritchey''-''Chretien''
- Modified Ritchey–Chrétien
- RCC Telescope
- RCOS
- Richey-Chrétien
- Ritchey-Chretein
- Ritchey-Chretien
- Ritchey-Chretien reflector
- Ritchey-Chretien telescope
- Ritchey-Chrétien
- Ritchey–Chrétien
- Ritchey–Chrétien design
- Ritchey–Chrétien reflector
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