XuXueFeng

Based on data on Internet and promoting materials from Montabert, the paper studies the structures and technical characteristics of hydraulic drifters from Montabert. It highlights the technical characteristics of the blank firing and brake structure, composite piston, shape of the progressive

This paper gives the definition of the rock drilling jumbo for tunnel and describes China's manufacturers of rock drilling jumbos for tunnel and models of their products. The rock drilling jumbos are divided into 2 classes herein: jumbos with the usage report and jumbos without the usage report.