Jisho

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Noun
1. city gas; mains gas; gas supplied to buildings via pipes
Wikipedia definition
2. Coal gasCoal gas (also town gas and illumination gas) is a flammable gaseous fuel made by the destructive distillation of coal containing a variety of calorific gases including hydrogen, carbon monoxide, methane and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.
Read “Coal gas” on English Wikipedia
Read “都市ガス” on Japanese Wikipedia
Read “Coal gas” on DBpedia

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