Sentence:  But through the oligopoly, charcoal fuel proliferated throughout London's trades and industries. By the 1200s, brewers and bakers, tilemakers, glassblowers, pottery <WSD>producers</WSD>, and a range of other craftsmen all became hour-to-hour consumers of charcoal. 
Meaning of the word marked with <WSD> tags:  An individual or organization that creates goods and services.