42 Engineering and technical consultancy regarding the industrial furnaces and parts therefor, and auxiliary installations for firing limestone and dolomite, namely, shaft furnaces, high-temperature furnaces for sintering dolomite and magnesite and for manufacturing tabular alumina, and shelf furnaces for calcining carbonates; planning, namely, construction drafting and technical project planning, technical analysis and surveying in connection with and of industrial furnaces and parts therefor, and auxiliary installations for firing limestone and dolomite, namely, shaft furnaces, high-temperature furnaces for sintering dolomite and magnesite and for manufacturing tabular alumina, and shelf furnaces for calcining carbonates; commissioning, namely, starting-up, examination, and validation on site to confirm functionality, of industrial furnaces and parts therefor, and auxiliary installations for firing limestone and dolomite, namely, shaft furnaces, high-temperature furnaces for sintering dolomite and magnesite and for manufacturing tabular alumina, and shelf furnaces for calcining carbonates; quality monitoring of industrial furnaces and parts therefor, and auxiliary installations for firing limestone and dolomite, namely, shaft furnaces, high-temperature furnaces for sintering dolomite and magnesite and for manufacturing tabular alumina, and shelf furnaces for calcining carbonates