The company "Certificate" was founded in 1992. by releasing a self-contained unit "Laboratory of standardization and quality control of extracted coal" institution DonUGI. napravlenieya Main activity: Development and manufacturing of control devices of various binary mixtures in the flow , in particular the control of coal and ash content of Al 2 O 3 in bauxite. Principle their action is based on the technology of determining the composition of a mixture of natural radioactivity. Providing consulting services to enterprises of all forms of ownership.