IDS

Drilling muds for use in oil well drilling; chemicals used in oil drilling and chemical additives for oil well drilling fluid

Benzene, fuel oil, fuel gas and mazut, namely, petroleum residue

Mine borers, drilling rigs, floating or non-floating, drilling heads, namely, parts of machines; drilling machines, oil refining machines, hydraulic engines and motors for use in oil well drilling and gas well drilling, pumps as parts of machines, engines or motors

Drilling of wells, rebuilding engines that have been worn or partially destroyed, rebuilding machines that have been worn or partially destroyed, rental of construction equipment, rental of bulldozers, construction cranes, excavators; pump repair, pipeline construction and maintenance, building construction supervision, machinery installation, maintenance and repair

Chemical analysis, conducting of feasibility studies, engineering, geological research, analysis for oil-field exploration, oil-well testing, quality control for others, geological surveys, oil-field surveys, geological prospecting, oil prospecting, computer software design, chemistry consultation services and surveying