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3521 - Gas production
Definition / Belongs to this divisionThis division includes:- gas production for service purposes, by gasification of non-petroleum coal, from agricultural by-products or waste (eg coal, water, generator gas, gas works gas)
- production of gaseous fuels of adequate calorific value by purification, blending and other processes of various gases, including natural gas
It does not belong to this sectorThis division excludes:
- extraction of natural gas, see 0620
- manufacture of coke, see 1910
- manufacture of refined petroleum products, see 1920
- manufacture of industrial gases, see 2011
It does not belong to this branch - Hungarian supplementThis division excludes - Hungarian supplement:
- biogas production, see 3821