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William Addis (entrepreneur) - Wikipedia
William Edward Addis Inventor of Toothbrush - Researchpedia
A Visual History of the Toothbrush | Museum of Every Day Life
Who invented the toothbrush? - HISTORY
Who invented the toothbrush and when was it invented?
William Addis 1780 - Made up in Britain: Toothbrush
Who Made That Toothbrush? - The New York Times
William Addis biography, list of William Addis inventions
Wiliam Addis, the Mass-Produced Toothbrush - 2016-04-01 - Forbes
William Addis (entrepreneur) facts for kids - Kids encyclopedia