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OG-9B
The OG-9B (ОГ-9Б) is a 73 mm, high explosive fragmentation (HE-frag) fin-stabilised tracer (HE-FS-T) projectile, which was developed in Bulgaria while part of the Warsaw Pact. The OG-9B forms part of the OG-9VB (ОГ-9ВБ) and OG-15VB (ОГ-15ВБ) rounds, which are covered in the 'Usage' area and within separate entries. The introduction date is OG-9B and its rounds are unknown, but rounds have been found marked-up with production dates as early...
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