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格瑞道（ＧＲＡＤＡＬＬ）公司成立于１９４６年，长期以来，一直以其结构独特的伸缩臂式挖掘机和伸缩臂式叉装车受到广大用户的青睐。１ 伸缩臂液压挖掘机（１）生产率高高压液压系统使格瑞道伸缩臂液压挖掘机（图１）的生产率提高一倍，而耗油量仅为原来的一半。高压液压系
GRADALL was founded in 1946 and has long been favored by its customers for its unique structure of telescopic boom excavators and telescopic forklift trucks. 1 Telescopic boom Hydraulic Excavator (1) High Productivity High-pressure hydraulics double the productivity of the Griffith Telescopic Hydraulic Excavator (Figure 1), while fuel consumption is only half the original. High-pressure hydraulic system