Oldest first. Sources: Wikipedia, Wikidata.Β· National Coal Board on WikipediaΒ· Logo: National Coal Board, Public domain Β· trademark. Photos from Wikimedia Commons.Logos come from Wikimedia Commons (a few are the icon from the companyβs own website). Most are public domain as simple text or shapes, but they remain trademarks of their owners and are shown only to identify the maker or operator. All operators.