DRILLING OF WELLS; [ FACTORY CONSTRUCTION; FURNACE AND SMELTER INSTALLATION AND REPAIR; INSTALLATION AND REPAIR OF FREEZING EQUIPMENT; ] MACHINERY INSTALLATION, MAINTENANCE AND REPAIR; [ MINING EXTRACTION; QUARRYING SERVICES; ] [ PIPELINE CONSTRUCTION AND ] MAINTENANCE OF PIPELINES FOR OIL, GAS AND PETROLEUM [ ; ROAD PAVING ]

TREATMENT OF COMMON METALS [, TREATMENT OF PRECIOUS METALS, TREATMENT OF METALLIC ORES, TREATMENT OF METAL ALLOYS, ] [ TREATMENT OF CHEMICALS ] ; [ COPPERSMITHING; ELECTROPLATING; GILDING; GOLD-PLATING; LASER SCRIBING OF GEMS; PRECIOUS GEM CUTTING, GRINDING AND POLISHING; SILVERPLATING; ] MATERIAL TREATMENT INFORMATION SUPPLIED ON-LINE OR BY ANY OTHER MEANS; [ CUSTOM MANUFACTURE OF JEWELRY; PROCESSING AND TREATMENT OF ORES AND METALS; ] PROCESSING AND REFINING OF OIL AND GAS, NAMELY, OIL AND GAS TREATMENT; [ FREEZING OF GASES FOR OTHERS; ] SEPARATING AND FRACTIONING LIQUIDS FOR NATURAL GAS [ ; LIQUEFACTION OF NATURAL GAS; EXTRACTION OF METALS FROM MINERALS ]