WHO WE ARE. Shanghai GBMachine Mining and Construction Machinery Co., Ltd. is a hi-tech, engineering group. We are specialized in the research, development, and production of industrial crushing, powder grinding, mineral processing equipments and other related devices.
A stone tool is, in the most general sense, any tool made either partially or entirely out of stone.Although stone tool-dependent societies and cultures still exist today, most stone tools are associated with prehistoric, particularly Stone Age cultures that have become extinct.
By Tearz Ayuen I presume everyone knows that being the world's newest state, South Sudan is faced with a number of challenges. But what everybody doesn't know though is what exactly these challenges are and how they came or come about.