PROBLEM TO BE SOLVED: To improve loading performance and travel stability by lowering a vessel height.;SOLUTION: Vessel carriers 17 interposed between main frames 9a of a revolving frame 9 and vessel bottom plates 8a are disposed beside the main frames 9a. A revolving circle 12 and a swivel joint 14 are mounted on a track frame bottom plate 11b.;COPYRIGHT: (C)2002,JPO
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