ZPU series
From Wikimedia Commons, the free media repository
ZPU-1, ZPU-2 (double) and ZPU-4 (quadruple) are Soviet 14.5 mm anti-aircraft guns.
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ZPU-1 in Batey ha-Osef Museum, Israel.
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ZPU-4 in Batey ha-Osef Museum, Israel.
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ZPU-4 mounted on Unimog truck in Batey ha-Osef Museum, Israel.
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ZPU-4 in Saint Petersburg Artillery museum, Russia.