_:vb6805506 "2006, Edwin Black, chapter 2, in Internal Combustion\u200E[1]:"@en . _:vb6805505 "Made of charcoal."@en . _:vb6805506 . _:vb6805506 "But through the oligopoly, charcoal fuel proliferated throughout London's trades and industries.\u00A0 By the 1200s, brewers and bakers, tilemakers, glassblowers, pottery producers, and a range of other craftsmen all became hour-to-hour consumers of charcoal."@en . "2" . _:vb6805505 . .