The Ilyushin IL-20 is the militarized form of the base Soviet-era IL-18 "Coot" quad-turboprop passenger hauler. The original IL-18 design saw a first-flight on July 4th, 1957 and production was handled by Moscow Machinery Plant No. 30 to which at least 678 examples were ultimately delivered for various civilian- and military-minded tasks worldwide. More @Wikipedia
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