NR-23

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English: The NR-23, Nudelman-Rikhter NR-23 was a 23 mm aircraft autocannon
Deutsch: Die NR-23 Nudelman-Richter war eine 23 mm Flugzeug-Maschinenkanone
Русский: НР-23: Нудельман Рихтер НР-23, авиационная пушка