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This file is a work of a US military or federal government employee, taken or made during the course of an employee's official duties. As a work of the US Federal Government, the file is in the public domain. (Title 17, Chapter 1, Section 105 of the US Code)
Source: Source Asian Defence and Technology 
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The ZSU-57-2 is a Soviet-made, self-propelled, anti-aircraft gun. It is equipped with dual-57mm...