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"The M-60 Main Battle Tank entered production in 1960, developed in response to increasingly advanced Soviet tanks. More than 15,000 of these tanks were manufactured before production ceased in 1987. Explore the M-60 Main Battle Tank."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/m-60-main-battle-tank.htm>