Profile of Mr. Allen Chao and hisShenzhen U Rare Stone Consultant LtdMr. Allen Chao came into stone sector in 1993.As a Mechanical Engineer and Senior Engineer of Building Materials, he devoted to in more than 25 years in stone industry, including works on stone equipment, process, production, technology and management.His expertise include not only the knowledge about natural stone quarries and varieties, artificial stone market of home