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The K-JC 503 mobile mini jaw crusher is an ideal solution for construction companies and contractors who want to recycle concrete onsite. ... Home » Small Concrete Crushers For Sale » K-JC 503 Mobile Mini Jaw Crusher. 12 MONTHS / 1000 HOURS WARRANTY Whichever is earlier Add to quote. Share. Home / Crusher / K-JC 503 Mobile Mini Jaw …