Installation, repair and maintenance of all kind of products in connection with the mining industry, namely, bulldozers, brushcutter bulldozers, amphibious bulldozers, tire bulldozers, dozers, plowshares, threshers, automotive scrapers, reamers, rake pushers, machinery and apparatus for earth transportation, namely, loaders, wheel loaders, earth compactors and tractor-towed mining instruments in the nature of chargers, machines in the nature of hoppers and mechanical discharge hoppers, excavators, namely, backhoes, pushing blades in the nature of front end loaders, brushcutter pushing blades, swing pushing blades, dredgers in the nature of excavators buckets, power mining shovels, mechanical shovels, trenchers, drilling machines and tunnel boring machines, cistern ponds, ponds, and rollers, machinery and apparatus for construction, namely, power sledge hammers, pneumatic road rollers, road rollers, asphalt finishers, vibratory rollers, vibratory plate compactors, earth moving machines in the nature of graders, machinery and power-operated tools for metal processing, namely, mechanical presses, hydraulic presses, extruders in the nature of wire extruding machines, metal extrusion presses, shapers, benders, shearers, stretchers, planing machines, percussion boring machines, stump milling cutters, crankshaft milling cutters, cylinder block deburring machines, slicers, machine tools for swaging metal, machine tools in the nature of lathes, notchers, grinding machines, laser engraving machines, mask-type laser marking machines, complex-type laser marking machines, conveyor belts, current generators and dynamos, chain saws, power-operated bruschcutters, air compressors, truck cranes, transmissions for machines for the above articles, mining machines, and mining drills; rental services, namely rental of mining tools, and of mining and building equipment; building construction services; building construction inspection; construction supervision and construction management; engineering services; mining extraction and exploitation of oil fields