said floating support means of said conveying unit includes two substantially {HEAD ~ the same rear floating support mechanisms} that support {TAIL ~ at least two places} of said rear side frame of said conveying unit, as well as a front floating support mechanism that supports at least one place of said front side frame 
said floating support means of said conveying unit includes two substantially { HEAD ~ the same rear floating support mechanisms } that support { TAIL ~ at least two places } of said rear side frame of said conveying unit , as well as a front floating support mechanism that supports at least one place of said front side frame
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