NR-23

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

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  NR-23 cannons in tail barbette of the Il-28 bomber
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  MiG-17 cannons: N-37 and NR-23