Import-export agency services; retail services or wholesale services for fuel.

Repair or maintenance of vessels; repair or maintenance of loading-unloading machines and apparatus; repair or maintenance of air conditioners for industrial purposes; repair or maintenance of burners; repair or maintenance of boilers; repair or maintenance of pumps; repair or maintenance of freezing machines and apparatus for industrial purposes; repair or maintenance of electronic machines and apparatus; repair or maintenance of electric motors; repair or maintenance of power distribution or control machines and apparatus; repair or maintenance of power generators; repair or maintenance of laboratory apparatus and instruments; repair or maintenance of chemical processing machines and apparatus; repair or maintenance of industrial furnaces; repair or maintenance of water pollution control equipment; repair or maintenance of water purifying apparatus for industrial purposes; repair or maintenance of chemical plants; repair or maintenance of nuclear power plants.

Gas supplying [distribution]; electricity distribution; water supplying [distribution]; heat supplying [distribution]; collection of domestic waste and trash; collection of industrial waste and trash.

Production of energy; woodworking; water treating; recycling of waste and trash; nuclear fuel reprocessing; recycling, sorting and disposal of domestic waste and trash; recycling, sorting and disposal of industrial waste and trash.

Geological surveys or research; designing of machines, apparatus, instruments [including their parts] or systems composed of such machines, apparatus and instruments; testing or research on prevention of pollution; testing or research on electricity; testing or research on machines, apparatus and instruments.