Manufacture of gas; distribution of gaseous fuels through mains

This class excludes: - operation of coke ovens, see 1910 - manufacture of refined petroleum products, see 1920 - manufacture of industrial gases, see 2011 - wholesale of gaseous fuels, see 4661 - retail sale of bottled gas, see 4773 - direct selling of fuel, see 4799 - (long-distance) transportation of gases by pipelines, see 4930