Stretch device "longer working device excavator stick and boom length of 15 m, 0.4 m3 bucket, which is produced on the basis of market research and adequate technical demonstration from choice of materials, technologies and processes, design and production to ensure the structural strength of the product performance and quality, the boom has an internal bumper can be a greater degree to bear the load, extending the life of the excavator. mainly applied to the river dammed lake clean-up, slope finishing, earth and stone foundation and deep-cut mining operations. 
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