五、Production volume of main drilling tools in our country   5.1,Output of Drilling Tools for Light Rock Drilling Machinery H22mm tapered connection drill rod. The current annual output is 80,000 […]

一、Classification of rock drilling tools and engineering drilling tools According to the action principle of rock drilling tools when breaking rock, rock drilling can be divided […]

Sea Freight rates have risen at crazy way!  “Container crisis” still unsolved! Global shipping will usher in “the craziest summer in shipping from April start “! Sea ports […]

Where does the original inspiration of We-media people come from? I don’t know how many people ever asked me. Yesterday, Mr. Liu, who flew over from Changsha, is the head […]